readme change

audit: fix issues #1-#9 (mock data, notifier interface, retry/timeout, digest scheduling, real status, RPC retry, dedup, address edit UI)
- #1: remove mock alert events that poisoned production responses - #2: add Notifier interface + Send implementations for all channels - #3/#4: notification goroutines now carry a 30s context timeout and retry up to 3x with exponential backoff - #5: schedule email digest in poller via DIGEST_INTERVAL_HOURS (default 24h) - #6: SystemStatus queries real checkpoint data; returns starting/active/idle with latestBlock and lag - #7: Ethereum RPC client retries on network errors, 429, and 5xx with 1s/2s backoff - #8: alert_events dedup index + ON CONFLICT DO NOTHING to prevent duplicate events on poller restart - #9: PATCH /v1/addresses/{id} for label editing; frontend address list gains inline edit and remove buttons
2026-03-01 07:55:00 -05:00 · 2026-03-01 07:49:08 -05:00 · 2026-03-01 04:37:58 -05:00 · 2026-03-01 04:31:32 -05:00 · 2026-03-01 03:54:06 -05:00 · 2026-03-01 03:37:04 -05:00
33 changed files with 1801 additions and 293 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,4 @@ Prompts/

 # Logs
 *.log
+.claude
--- a/README.md
+++ b/README.md
@@ -1,9 +1,8 @@
 # Koin Ping
+A lightweight on-chain monitoring and alerting system designed to give users situational awareness over blockchain addresses they care about.

-Koin Ping is an MIT-licensed blockchain monitoring system by Steven Jannette
-that polls Ethereum addresses for on-chain activity and delivers real-time
-alerts to users via a Go REST API backend and a React single-page application
-frontend.
+# Overview
+Koin Ping observes on-chain activity and notifies users when predefined conditions are met. It does not execute transactions, manage wallets, or speculate on prices.

 ## Getting Started

@@ -99,20 +98,6 @@ to the database, and dispatches Discord notifications.
 Firebase, communicates with the API via fetch, and renders the address/alert
 management UI.

-## TODO
-
- [ ] Switch frontend package manager from npm to yarn (per repo policy)
- [ ] Rename `go.mod` module path from `github.com/kjannette/koin-ping` to
-      `sneak.berlin/go/koin-ping` (per repo policy)
- [ ] Move database migrations to `internal/db/migrations/` and embed them in
-      the binary
- [ ] Pin all Docker base images by `@sha256` in Dockerfile
- [ ] Install `golangci-lint` locally and pass `make lint`
- [ ] Add vitest unit tests for the React frontend
- [ ] Add a `make db-reset` / `make migrate` target for schema management
- [ ] Set HTTP server read/write timeouts (currently unbounded)
- [ ] Replace `log.Printf` calls with structured `log/slog`
-
 ## License

 MIT. See [LICENSE](LICENSE).
--- a/backend-go/.env.example
+++ b/backend-go/.env.example
@@ -14,3 +14,7 @@ POLL_INTERVAL_MS=60000

 # Firebase
 FIREBASE_PROJECT_ID=koin-ping
+
+# Email notifications (Resend — https://resend.com)
+# RESEND_API_KEY=re_xxxxxxxxxxxx
+# EMAIL_FROM=Koin Ping <alerts@yourdomain.com>
--- a/backend-go/cmd/api/main.go
+++ b/backend-go/cmd/api/main.go
@@ -14,12 +14,13 @@ import (
 	"github.com/kjannette/koin-ping/backend-go/internal/handlers"
 	"github.com/kjannette/koin-ping/backend-go/internal/middleware"
 	"github.com/kjannette/koin-ping/backend-go/internal/models"
+	"github.com/kjannette/koin-ping/backend-go/internal/services"
 )

 const (
-	// serverReadTimeoutSeconds is the maximum duration to read a request.
+	// max duration to read a request.
 	serverReadTimeoutSeconds = 5
-	// serverWriteTimeoutSeconds is the maximum duration to write a response.
+	// maxiduration to write a response.
 	serverWriteTimeoutSeconds = 10
 )

@@ -46,19 +47,26 @@ func main() {
 	addressModel := models.NewAddressModel(pool)
 	alertRuleModel := models.NewAlertRuleModel(pool)
 	alertEventModel := models.NewAlertEventModel(pool)
+	checkpointModel := models.NewCheckpointModel(pool)
 	notifConfigModel := models.NewNotificationConfigModel(pool)

+	emailDigestSvc := services.NewEmailDigestService(
+		cfg.ResendAPIKey, cfg.EmailFrom, alertEventModel, notifConfigModel,
+	)
+
 	addressHandler := handlers.NewAddressHandler(addressModel)
 	alertRuleHandler := handlers.NewAlertRuleHandler(alertRuleModel, addressModel)
 	alertEventHandler := handlers.NewAlertEventHandler(alertEventModel)
-	notifConfigHandler := handlers.NewNotificationConfigHandler(notifConfigModel)
+	notifConfigHandler := handlers.NewNotificationConfigHandler(notifConfigModel, cfg)
+	emailDigestHandler := handlers.NewEmailDigestHandler(emailDigestSvc, notifConfigModel)
+	statusHandler := handlers.NewStatusHandler(checkpointModel)

 	mux := http.NewServeMux()
 	b := cfg.APIBasePath // e.g. "/v1"

 	// Public routes
 	mux.HandleFunc("GET "+b+"/health", handlers.HealthCheck)
-	mux.HandleFunc("GET "+b+"/status", handlers.SystemStatus)
+	mux.HandleFunc("GET "+b+"/status", statusHandler.GetStatus)

 	// Authenticated routes — addresses
 	mux.Handle("POST "+b+"/addresses",
@@ -67,8 +75,10 @@ func main() {
 		middleware.Authenticate(http.HandlerFunc(addressHandler.List)))
 	mux.Handle("DELETE "+b+"/addresses/{addressId}",
 		middleware.Authenticate(http.HandlerFunc(addressHandler.Remove)))
+	mux.Handle("PATCH "+b+"/addresses/{addressId}",
+		middleware.Authenticate(http.HandlerFunc(addressHandler.UpdateLabel)))

-	// Authenticated routes — alert rules
+	// Authenticated routes for alert rules
 	mux.Handle("POST "+b+"/addresses/{addressId}/alerts",
 		middleware.Authenticate(http.HandlerFunc(alertRuleHandler.Create)))
 	mux.Handle("GET "+b+"/addresses/{addressId}/alerts",
@@ -89,6 +99,14 @@ func main() {
 		middleware.Authenticate(http.HandlerFunc(notifConfigHandler.UpdateConfig)))
 	mux.Handle("DELETE "+b+"/notification-config",
 		middleware.Authenticate(http.HandlerFunc(notifConfigHandler.DeleteConfig)))
+	mux.Handle("POST "+b+"/notification-config/test",
+		middleware.Authenticate(http.HandlerFunc(notifConfigHandler.TestChannels)))
+
+	// Authenticated routes — email digest
+	mux.Handle("POST "+b+"/email/setup",
+		middleware.Authenticate(http.HandlerFunc(emailDigestHandler.SetupEmail)))
+	mux.Handle("POST "+b+"/email/digest",
+		middleware.Authenticate(http.HandlerFunc(emailDigestHandler.SendDigest)))

 	handler := corsMiddleware(mux)

--- a/backend-go/cmd/poller/main.go
+++ b/backend-go/cmd/poller/main.go
@@ -58,7 +58,11 @@ func main() {
 	notifConfigModel := models.NewNotificationConfigModel(pool)

 	observer := services.NewObserverService(eth, addressModel, checkpointModel)
-	evaluator := services.NewEvaluatorService(eth, alertRuleModel, alertEventModel, addressModel, notifConfigModel)
+	evaluator := services.NewEvaluatorService(
+		eth, alertRuleModel, alertEventModel, addressModel, notifConfigModel,
+		cfg.ResendAPIKey, cfg.EmailFrom,
+	)
+	digestSvc := services.NewEmailDigestService(cfg.ResendAPIKey, cfg.EmailFrom, alertEventModel, notifConfigModel)

 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -75,12 +79,14 @@ func main() {
 	}()

 	interval := time.Duration(cfg.PollIntervalMS) * time.Millisecond
+	digestInterval := time.Duration(cfg.DigestIntervalHours) * time.Hour

 	log.Println(strings.Repeat("=", separatorWidth))
 	log.Println("Koin Ping Observer Poller Starting")
 	log.Println(strings.Repeat("=", separatorWidth))
 	log.Printf("RPC URL: %s", cfg.EthRPCURL)
 	log.Printf("Poll Interval: %dms (%ds)", cfg.PollIntervalMS, cfg.PollIntervalMS/msPerSecond)
+	log.Printf("Digest Interval: %dh", cfg.DigestIntervalHours)
 	log.Println(strings.Repeat("=", separatorWidth))

 	runCycle(ctx, observer, evaluator)
@@ -88,6 +94,9 @@ func main() {
 	ticker := time.NewTicker(interval)
 	defer ticker.Stop()

+	digestTicker := time.NewTicker(digestInterval)
+	defer digestTicker.Stop()
+
 	for {
 		select {
 		case <-ctx.Done():
@@ -96,6 +105,13 @@ func main() {
 			return
 		case <-ticker.C:
 			runCycle(ctx, observer, evaluator)
+		case <-digestTicker.C:
+			sent, digestErr := digestSvc.SendDigestsForAllUsers(ctx)
+			if digestErr != nil {
+				log.Printf("Email digest failed: %v", digestErr)
+			} else {
+				log.Printf("Sent %d email digests", sent)
+			}
 		}
 	}
 }
--- a/backend-go/go.mod
+++ b/backend-go/go.mod
@@ -42,6 +42,7 @@ require (
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
+	github.com/resend/resend-go/v3 v3.1.1 // indirect
 	github.com/spiffe/go-spiffe/v2 v2.6.0 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
 	go.opentelemetry.io/contrib/detectors/gcp v1.39.0 // indirect
--- a/backend-go/go.sum
+++ b/backend-go/go.sum
@@ -92,6 +92,8 @@ github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10/go.mod h1
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/resend/resend-go/v3 v3.1.1 h1:Uwpf/tZU+O/r/3nMWE6zUAMIG9dX/vTBS3wlQzYJKSw=
+github.com/resend/resend-go/v3 v3.1.1/go.mod h1:iI7VA0NoGjWvsNii5iNC5Dy0llsI3HncXPejhniYzwE=
 github.com/spiffe/go-spiffe/v2 v2.6.0 h1:l+DolpxNWYgruGQVV0xsfeya3CsC7m8iBzDnMpsbLuo=
 github.com/spiffe/go-spiffe/v2 v2.6.0/go.mod h1:gm2SeUoMZEtpnzPNs2Csc0D/gX33k1xIx7lEzqblHEs=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
--- a/backend-go/infra/migrations/003_add_slack_webhook.sql
+++ b/backend-go/infra/migrations/003_add_slack_webhook.sql
@@ -0,0 +1,2 @@
+ALTER TABLE user_notification_configs
+  ADD COLUMN IF NOT EXISTS slack_webhook_url TEXT;
--- a/backend-go/infra/migrations/004_alert_event_dedup.sql
+++ b/backend-go/infra/migrations/004_alert_event_dedup.sql
@@ -0,0 +1,3 @@
+CREATE UNIQUE INDEX IF NOT EXISTS idx_alert_events_dedup
+    ON alert_events (alert_rule_id, tx_hash)
+    WHERE tx_hash IS NOT NULL;
--- a/backend-go/infra/schema.sql
+++ b/backend-go/infra/schema.sql
@@ -54,8 +54,9 @@ CREATE TABLE user_notification_configs (
  user_id VARCHAR(128) PRIMARY KEY,
  discord_webhook_url TEXT,            -- Discord webhook URL (nullable)
  telegram_chat_id VARCHAR(128),       -- Telegram chat ID (nullable)
-  telegram_bot_token VARCHAR(255),     -- Telegram bot token (nullable, future use)
+  telegram_bot_token VARCHAR(255),     -- Telegram bot token (nullable)
  email VARCHAR(255),                  -- Email for notifications (nullable)
+  slack_webhook_url TEXT,              -- Slack incoming webhook URL (nullable)
  notification_enabled BOOLEAN DEFAULT TRUE,  -- Master on/off switch
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
--- a/backend-go/internal/config/config.go
+++ b/backend-go/internal/config/config.go
@@ -13,6 +13,7 @@ const (
 	defaultDBPort = 5432
 	defaultPollIntervalMS = 60000
 	minPollIntervalMS = 1000
+	defaultDigestIntervalHours = 24
 )

 type Config struct {
@@ -28,6 +29,9 @@ type Config struct {
 	EthRPCURL         string
 	PollIntervalMS    int
 	NodeEnv           string
+	ResendAPIKey         string
+	EmailFrom            string
+	DigestIntervalHours  int
 }

 // Load reads configuration from environment variables and returns a Config.
@@ -45,6 +49,9 @@ func Load() (*Config, error) {
 		EthRPCURL:         os.Getenv("ETH_RPC_URL"),
 		PollIntervalMS:    getEnvInt("POLL_INTERVAL_MS", defaultPollIntervalMS),
 		NodeEnv:           getEnv("NODE_ENV", "development"),
+		ResendAPIKey:        os.Getenv("RESEND_API_KEY"),
+		EmailFrom:           getEnv("EMAIL_FROM", "Koin Ping <alerts@koinping.com>"),
+		DigestIntervalHours: getEnvInt("DIGEST_INTERVAL_HOURS", defaultDigestIntervalHours),
 	}

 	if cfg.PollIntervalMS < minPollIntervalMS {
--- a/backend-go/internal/domain/types.go
+++ b/backend-go/internal/domain/types.go
@@ -103,8 +103,9 @@ type NotificationConfig struct {
 	UserID              string     `json:"user_id"`              //nolint:tagliatelle
 	DiscordWebhookURL   *string    `json:"discord_webhook_url"`  //nolint:tagliatelle
 	TelegramChatID      *string    `json:"telegram_chat_id"`     //nolint:tagliatelle
-	TelegramBotToken    *string    `json:"telegram_bot_token,omitempty"` //nolint:tagliatelle
+	TelegramBotToken    *string    `json:"telegram_bot_token"`   //nolint:tagliatelle
 	Email               *string    `json:"email"`
+	SlackWebhookURL     *string    `json:"slack_webhook_url"`    //nolint:tagliatelle
 	NotificationEnabled bool       `json:"notification_enabled"` //nolint:tagliatelle
 	CreatedAt           *time.Time `json:"created_at,omitempty"` //nolint:tagliatelle
 	UpdatedAt           *time.Time `json:"updated_at,omitempty"` //nolint:tagliatelle
--- a/backend-go/internal/handlers/address.go
+++ b/backend-go/internal/handlers/address.go
@@ -92,6 +92,44 @@ func (h *AddressHandler) List(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, addresses)
 }

+// UpdateLabel handles PATCH requests to update an address label.
+func (h *AddressHandler) UpdateLabel(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.GetUserID(r.Context())
+	addressID, ok := parseIntParam(r.PathValue("addressId"))
+	if !ok {
+		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "Invalid address ID")
+
+		return
+	}
+
+	var body struct {
+		Label *string `json:"label"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR", "Invalid request body")
+
+		return
+	}
+
+	log.Printf("User %s updating label for address ID: %d", userID, addressID)
+
+	addr, err := h.addresses.UpdateLabel(r.Context(), addressID, userID, body.Label)
+	if err != nil {
+		log.Printf("Error updating address label: %v", err)
+		writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "Failed to update address")
+
+		return
+	}
+
+	if addr == nil {
+		writeError(w, http.StatusNotFound, "NOT_FOUND", "Address not found")
+
+		return
+	}
+
+	writeJSON(w, http.StatusOK, addr)
+}
+
 // Remove handles DELETE requests to remove a tracked address.
 func (h *AddressHandler) Remove(w http.ResponseWriter, r *http.Request) {
 	userID := middleware.GetUserID(r.Context())
--- a/backend-go/internal/handlers/alert_event.go
+++ b/backend-go/internal/handlers/alert_event.go
@@ -4,7 +4,6 @@ import (
 	"log"
 	"net/http"
 	"strconv"
-	"time"

 	"github.com/kjannette/koin-ping/backend-go/internal/domain"
 	"github.com/kjannette/koin-ping/backend-go/internal/middleware"
@@ -51,45 +50,9 @@ func (h *AlertEventHandler) List(w http.ResponseWriter, r *http.Request) {

 	log.Printf("Found %d alert events for user", len(events))

-	// MVP scaffolding: return mock data if DB is empty
-	if len(events) == 0 {
-		events = mockEvents(limit)
+	if events == nil {
+		events = []domain.AlertEvent{}
 	}

 	writeJSON(w, http.StatusOK, events)
 }
-
-func mockEvents(limit int) []domain.AlertEvent {
-	label1 := "Treasury Wallet"
-	label2 := "Cold Storage"
-
-	mocks := []domain.AlertEvent{
-		{
-			ID:           1,
-			AlertRuleID:  1,
-			Message:      "Incoming transaction detected: 5.5 ETH received",
-			AddressLabel: &label1,
-			Timestamp:    time.Now().Add(-2 * time.Hour),
-		},
-		{
-			ID:           2,           //nolint:mnd
-			AlertRuleID:  2,           //nolint:mnd
-			Message:      "Balance dropped below threshold: Current balance 8.2 ETH",
-			AddressLabel: &label1,
-			Timestamp:    time.Now().Add(-5 * time.Hour),
-		},
-		{
-			ID:           3,           //nolint:mnd
-			AlertRuleID:  3,           //nolint:mnd
-			Message:      "Outgoing transaction detected: 2.0 ETH sent",
-			AddressLabel: &label2,
-			Timestamp:    time.Now().Add(-24 * time.Hour),
-		},
-	}
-
-	if limit < len(mocks) {
-		return mocks[:limit]
-	}
-
-	return mocks
-}
--- a/backend-go/internal/handlers/email_digest.go
+++ b/backend-go/internal/handlers/email_digest.go
@@ -0,0 +1,101 @@
+package handlers
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/kjannette/koin-ping/backend-go/internal/middleware"
+	"github.com/kjannette/koin-ping/backend-go/internal/models"
+	"github.com/kjannette/koin-ping/backend-go/internal/services"
+)
+
+type EmailDigestHandler struct {
+	digestSvc *services.EmailDigestService
+	configs   *models.NotificationConfigModel
+}
+
+func NewEmailDigestHandler(
+	digestSvc *services.EmailDigestService,
+	configs *models.NotificationConfigModel,
+) *EmailDigestHandler {
+	return &EmailDigestHandler{digestSvc: digestSvc, configs: configs}
+}
+
+// SetupEmail reads the user's email from their notification config and sends
+// a confirmation message via Resend to verify the integration works.
+func (h *EmailDigestHandler) SetupEmail(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.GetUserID(r.Context())
+
+	if !h.digestSvc.Configured() {
+		writeError(w, http.StatusServiceUnavailable, "EMAIL_NOT_CONFIGURED",
+			"Email service is not configured on the server")
+		return
+	}
+
+	cfg, err := h.configs.GetConfig(r.Context(), userID)
+	if err != nil {
+		log.Printf("Error getting notification config for email setup: %v", err)
+		writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR",
+			"Failed to load notification config")
+		return
+	}
+
+	if cfg == nil || cfg.Email == nil || *cfg.Email == "" {
+		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR",
+			"Save an email address in notification settings first")
+		return
+	}
+
+	if err := h.digestSvc.SetupEmail(*cfg.Email); err != nil {
+		log.Printf("Email setup failed for user %s: %v", userID, err)
+		writeError(w, http.StatusBadGateway, "EMAIL_SEND_FAILED",
+			"Failed to send confirmation email — check server email config")
+		return
+	}
+
+	log.Printf("Email setup confirmation sent to user %s (%s)", userID, *cfg.Email)
+	writeJSON(w, http.StatusOK, map[string]any{
+		"success": true,
+		"email":   *cfg.Email,
+		"message": "Confirmation email sent",
+	})
+}
+
+// SendDigest compiles and sends a digest of recent alerts to the user's email.
+func (h *EmailDigestHandler) SendDigest(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.GetUserID(r.Context())
+
+	if !h.digestSvc.Configured() {
+		writeError(w, http.StatusServiceUnavailable, "EMAIL_NOT_CONFIGURED",
+			"Email service is not configured on the server")
+		return
+	}
+
+	cfg, err := h.configs.GetConfig(r.Context(), userID)
+	if err != nil {
+		log.Printf("Error getting notification config for digest: %v", err)
+		writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR",
+			"Failed to load notification config")
+		return
+	}
+
+	if cfg == nil || cfg.Email == nil || *cfg.Email == "" {
+		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR",
+			"No email address configured")
+		return
+	}
+
+	if err := h.digestSvc.SendDigest(r.Context(), userID, *cfg.Email); err != nil {
+		log.Printf("Digest send failed for user %s: %v", userID, err)
+		writeError(w, http.StatusBadGateway, "DIGEST_SEND_FAILED",
+			"Failed to send digest email")
+		return
+	}
+
+	log.Printf("Digest sent to user %s (%s)", userID, *cfg.Email)
+	writeJSON(w, http.StatusOK, map[string]any{
+		"success": true,
+		"email":   *cfg.Email,
+		"message": "Digest email sent",
+	})
+}
--- a/backend-go/internal/handlers/notification_config.go
+++ b/backend-go/internal/handlers/notification_config.go
@@ -7,19 +7,22 @@ import (
 	"regexp"
 	"strings"

+	"github.com/kjannette/koin-ping/backend-go/internal/config"
 	"github.com/kjannette/koin-ping/backend-go/internal/domain"
 	"github.com/kjannette/koin-ping/backend-go/internal/middleware"
 	"github.com/kjannette/koin-ping/backend-go/internal/models"
+	"github.com/kjannette/koin-ping/backend-go/internal/notifications"
 )

 var emailRe = regexp.MustCompile(`^[^\s@]+@[^\s@]+\.[^\s@]+$`)

 type NotificationConfigHandler struct {
 	configs *models.NotificationConfigModel
+	cfg     *config.Config
 }

-func NewNotificationConfigHandler(configs *models.NotificationConfigModel) *NotificationConfigHandler {
-	return &NotificationConfigHandler{configs: configs}
+func NewNotificationConfigHandler(configs *models.NotificationConfigModel, cfg *config.Config) *NotificationConfigHandler {
+	return &NotificationConfigHandler{configs: configs, cfg: cfg}
 }

 func (h *NotificationConfigHandler) GetConfig(w http.ResponseWriter, r *http.Request) {
@@ -51,7 +54,9 @@ func (h *NotificationConfigHandler) UpdateConfig(w http.ResponseWriter, r *http.
 	var body struct {
 		DiscordWebhookURL   *string `json:"discord_webhook_url"`
 		TelegramChatID      *string `json:"telegram_chat_id"`
+		TelegramBotToken    *string `json:"telegram_bot_token"`
 		Email               *string `json:"email"`
+		SlackWebhookURL     *string `json:"slack_webhook_url"`
 		NotificationEnabled *bool   `json:"notification_enabled"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
@@ -63,7 +68,8 @@ func (h *NotificationConfigHandler) UpdateConfig(w http.ResponseWriter, r *http.
 	log.Printf("User %s updating notification config", userID)

 	if body.DiscordWebhookURL == nil && body.TelegramChatID == nil &&
-		body.Email == nil && body.NotificationEnabled == nil {
+		body.TelegramBotToken == nil && body.Email == nil &&
+		body.SlackWebhookURL == nil && body.NotificationEnabled == nil {
 		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR",
 			"At least one configuration field must be provided")
 		return
@@ -76,6 +82,13 @@ func (h *NotificationConfigHandler) UpdateConfig(w http.ResponseWriter, r *http.
 		return
 	}

+	if body.SlackWebhookURL != nil && *body.SlackWebhookURL != "" &&
+		!strings.HasPrefix(*body.SlackWebhookURL, "https://hooks.slack.com/") {
+		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR",
+			"Invalid Slack webhook URL format")
+		return
+	}
+
 	if body.Email != nil && *body.Email != "" && !emailRe.MatchString(*body.Email) {
 		writeError(w, http.StatusBadRequest, "VALIDATION_ERROR",
 			"Invalid email address format")
@@ -90,7 +103,9 @@ func (h *NotificationConfigHandler) UpdateConfig(w http.ResponseWriter, r *http.
 	cfg := domain.NotificationConfig{
 		DiscordWebhookURL:   body.DiscordWebhookURL,
 		TelegramChatID:      body.TelegramChatID,
+		TelegramBotToken:    body.TelegramBotToken,
 		Email:               body.Email,
+		SlackWebhookURL:     body.SlackWebhookURL,
 		NotificationEnabled: enabled,
 	}

@@ -126,3 +141,76 @@ func (h *NotificationConfigHandler) DeleteConfig(w http.ResponseWriter, r *http.
 	log.Println("Notification config deleted")
 	w.WriteHeader(http.StatusNoContent)
 }
+
+// TestChannels sends a test message to all configured notification channels.
+func (h *NotificationConfigHandler) TestChannels(w http.ResponseWriter, r *http.Request) {
+	userID := middleware.GetUserID(r.Context())
+	log.Printf("User %s testing notification channels", userID)
+
+	cfg, err := h.configs.GetConfig(r.Context(), userID)
+	if err != nil {
+		log.Printf("Error getting notification config for test: %v", err)
+		writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "Failed to get notification config")
+		return
+	}
+
+	if cfg == nil {
+		writeError(w, http.StatusNotFound, "NOT_FOUND", "No notification configuration found")
+		return
+	}
+
+	type channelResult struct {
+		Channel string `json:"channel"`
+		Success bool   `json:"success"`
+		Error   string `json:"error,omitempty"`
+	}
+
+	var results []channelResult
+
+	if cfg.DiscordWebhookURL != nil && *cfg.DiscordWebhookURL != "" {
+		ok, testErr := notifications.TestDiscordWebhook(*cfg.DiscordWebhookURL)
+		res := channelResult{Channel: "discord", Success: ok}
+		if testErr != nil {
+			res.Error = testErr.Error()
+		}
+		results = append(results, res)
+	}
+
+	if cfg.TelegramBotToken != nil && *cfg.TelegramBotToken != "" &&
+		cfg.TelegramChatID != nil && *cfg.TelegramChatID != "" {
+		ok, testErr := notifications.TestTelegramWebhook(*cfg.TelegramBotToken, *cfg.TelegramChatID)
+		res := channelResult{Channel: "telegram", Success: ok}
+		if testErr != nil {
+			res.Error = testErr.Error()
+		}
+		results = append(results, res)
+	}
+
+	if cfg.SlackWebhookURL != nil && *cfg.SlackWebhookURL != "" {
+		ok, testErr := notifications.TestSlackWebhook(*cfg.SlackWebhookURL)
+		res := channelResult{Channel: "slack", Success: ok}
+		if testErr != nil {
+			res.Error = testErr.Error()
+		}
+		results = append(results, res)
+	}
+
+	if cfg.Email != nil && *cfg.Email != "" {
+		ok, testErr := notifications.TestEmailNotification(
+			h.cfg.ResendAPIKey, h.cfg.EmailFrom, *cfg.Email,
+		)
+		res := channelResult{Channel: "email", Success: ok}
+		if testErr != nil {
+			res.Error = testErr.Error()
+		}
+		results = append(results, res)
+	}
+
+	if len(results) == 0 {
+		writeError(w, http.StatusBadRequest, "NO_CHANNELS",
+			"No notification channels are configured")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{"results": results})
+}
--- a/backend-go/internal/handlers/status.go
+++ b/backend-go/internal/handlers/status.go
@@ -1,10 +1,67 @@
 package handlers

 import (
+	"log"
 	"net/http"
 	"time"
+
+	"github.com/kjannette/koin-ping/backend-go/internal/models"
 )

+// StatusHandler handles the system status endpoint.
+type StatusHandler struct {
+	checkpoints *models.CheckpointModel
+}
+
+// NewStatusHandler creates a new StatusHandler.
+func NewStatusHandler(checkpoints *models.CheckpointModel) *StatusHandler {
+	return &StatusHandler{checkpoints: checkpoints}
+}
+
+// GetStatus returns real-time system status derived from checkpoint data.
+func (h *StatusHandler) GetStatus(w http.ResponseWriter, r *http.Request) {
+	block, checkedAt, err := h.checkpoints.GetLatestBlock(r.Context())
+	if err != nil {
+		log.Printf("Error querying latest block: %v", err)
+		writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "Failed to get system status")
+
+		return
+	}
+
+	latestBlock := 0
+	lag := 0
+	status := "starting"
+
+	if checkedAt != nil {
+		lag = int(time.Since(*checkedAt).Seconds())
+		if lag > 600 { //nolint:mnd
+			status = "idle"
+		} else {
+			status = "active"
+		}
+	}
+
+	if block != nil {
+		latestBlock = *block
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"status":        status,
+		"latestBlock":   latestBlock,
+		"lag":           lag,
+		"lastCheckedAt": checkedAtStr(checkedAt),
+		"timestamp":     time.Now().UTC().Format(time.RFC3339),
+	})
+}
+
+func checkedAtStr(t *time.Time) string {
+	if t == nil {
+		return ""
+	}
+
+	return t.UTC().Format(time.RFC3339)
+}
+
 func HealthCheck(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]interface{}{
 		"status":    "ok",
@@ -12,12 +69,3 @@ func HealthCheck(w http.ResponseWriter, r *http.Request) {
 		"service":   "koin-ping-backend",
 	})
 }
-
-func SystemStatus(w http.ResponseWriter, r *http.Request) {
-	writeJSON(w, http.StatusOK, map[string]interface{}{
-		"latestBlock": 0,
-		"lag":         0,
-		"status":      "healthy",
-		"timestamp":   time.Now().UTC().Format(time.RFC3339),
-	})
-}
--- a/backend-go/internal/models/address.go
+++ b/backend-go/internal/models/address.go
@@ -107,6 +107,24 @@ func (m *AddressModel) FindByID(ctx context.Context, id int, userID *string) (*d
 	return &a, nil
 }

+// UpdateLabel updates the label for an address owned by userID.
+// Returns nil, nil if no row matched (address not found or not owned by user).
+func (m *AddressModel) UpdateLabel(ctx context.Context, id int, userID string, label *string) (*domain.Address, error) {
+	var a domain.Address
+	err := m.pool.QueryRow(ctx,
+		`UPDATE addresses SET label = $3 WHERE id = $1 AND user_id = $2
+		 RETURNING id, user_id, address, label, created_at`,
+		id, userID, label,
+	).Scan(&a.ID, &a.UserID, &a.Address, &a.Label, &a.CreatedAt)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return &a, nil
+}
+
 func (m *AddressModel) Remove(ctx context.Context, id int, userID string) (bool, error) {
 	tag, err := m.pool.Exec(ctx,
 		`DELETE FROM addresses WHERE id = $1 AND user_id = $2`,
--- a/backend-go/internal/models/alert_event.go
+++ b/backend-go/internal/models/alert_event.go
@@ -2,7 +2,9 @@ package models

 import (
 	"context"
+	"errors"

+	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/kjannette/koin-ping/backend-go/internal/domain"
 )
@@ -71,10 +73,15 @@ func (m *AlertEventModel) Create(ctx context.Context, alertRuleID int, message s
 	err := m.pool.QueryRow(ctx,
 		`INSERT INTO alert_events (alert_rule_id, message, address_label, tx_hash)
 		 VALUES ($1, $2, $3, $4)
+		 ON CONFLICT DO NOTHING
 		 RETURNING id, alert_rule_id, message, address_label, tx_hash, timestamp`,
 		alertRuleID, message, addressLabel, txHash,
 	).Scan(&e.ID, &e.AlertRuleID, &e.Message, &e.AddressLabel, &e.TxHash, &e.Timestamp)
 	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			// Duplicate silently skipped by ON CONFLICT DO NOTHING
+			return nil, nil
+		}
 		return nil, err
 	}
 	return &e, nil
--- a/backend-go/internal/models/checkpoint.go
+++ b/backend-go/internal/models/checkpoint.go
@@ -3,6 +3,7 @@ package models
 import (
 	"context"
 	"errors"
+	"time"

 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
@@ -17,6 +18,20 @@ func NewCheckpointModel(pool *pgxpool.Pool) *CheckpointModel {
 	return &CheckpointModel{pool: pool}
 }

+// GetLatestBlock returns the highest last_checked_block and its timestamp across all addresses.
+// Returns nil, nil, nil when no checkpoints exist yet.
+func (m *CheckpointModel) GetLatestBlock(ctx context.Context) (*int, *time.Time, error) {
+	var block *int
+	var checkedAt *time.Time
+	err := m.pool.QueryRow(ctx,
+		`SELECT MAX(last_checked_block), MAX(last_checked_at) FROM address_checkpoints`,
+	).Scan(&block, &checkedAt)
+	if err != nil {
+		return nil, nil, err
+	}
+	return block, checkedAt, nil
+}
+
 // GetLastCheckedBlock returns the last checked block for an address, or -1 if never checked.
 func (m *CheckpointModel) GetLastCheckedBlock(ctx context.Context, addressID int) (int, bool, error) {
 	var block int
--- a/backend-go/internal/models/notification_config.go
+++ b/backend-go/internal/models/notification_config.go
@@ -21,12 +21,12 @@ func (m *NotificationConfigModel) GetConfig(ctx context.Context, userID string)
 	var c domain.NotificationConfig
 	err := m.pool.QueryRow(ctx,
 		`SELECT user_id, discord_webhook_url, telegram_chat_id, telegram_bot_token,
-		        email, notification_enabled, created_at, updated_at
+		        email, slack_webhook_url, notification_enabled, created_at, updated_at
 		 FROM user_notification_configs
 		 WHERE user_id = $1`,
 		userID,
 	).Scan(&c.UserID, &c.DiscordWebhookURL, &c.TelegramChatID, &c.TelegramBotToken,
-		&c.Email, &c.NotificationEnabled, &c.CreatedAt, &c.UpdatedAt)
+		&c.Email, &c.SlackWebhookURL, &c.NotificationEnabled, &c.CreatedAt, &c.UpdatedAt)
 	if err != nil {
 		if errors.Is(err, pgx.ErrNoRows) {
 			return nil, nil
@@ -40,22 +40,24 @@ func (m *NotificationConfigModel) UpsertConfig(ctx context.Context, userID strin
 	var c domain.NotificationConfig
 	err := m.pool.QueryRow(ctx,
 		`INSERT INTO user_notification_configs
-		   (user_id, discord_webhook_url, telegram_chat_id, telegram_bot_token, email, notification_enabled, updated_at)
-		 VALUES ($1, $2, $3, $4, $5, $6, NOW())
+		   (user_id, discord_webhook_url, telegram_chat_id, telegram_bot_token,
+		    email, slack_webhook_url, notification_enabled, updated_at)
+		 VALUES ($1, $2, $3, $4, $5, $6, $7, NOW())
 		 ON CONFLICT (user_id)
 		 DO UPDATE SET
-		   discord_webhook_url = COALESCE($2, user_notification_configs.discord_webhook_url),
-		   telegram_chat_id = COALESCE($3, user_notification_configs.telegram_chat_id),
-		   telegram_bot_token = COALESCE($4, user_notification_configs.telegram_bot_token),
-		   email = COALESCE($5, user_notification_configs.email),
-		   notification_enabled = $6,
+		   discord_webhook_url = $2,
+		   telegram_chat_id = $3,
+		   telegram_bot_token = $4,
+		   email = $5,
+		   slack_webhook_url = $6,
+		   notification_enabled = $7,
 		   updated_at = NOW()
 		 RETURNING user_id, discord_webhook_url, telegram_chat_id, telegram_bot_token,
-		           email, notification_enabled, created_at, updated_at`,
+		           email, slack_webhook_url, notification_enabled, created_at, updated_at`,
 		userID, cfg.DiscordWebhookURL, cfg.TelegramChatID, cfg.TelegramBotToken,
-		cfg.Email, cfg.NotificationEnabled,
+		cfg.Email, cfg.SlackWebhookURL, cfg.NotificationEnabled,
 	).Scan(&c.UserID, &c.DiscordWebhookURL, &c.TelegramChatID, &c.TelegramBotToken,
-		&c.Email, &c.NotificationEnabled, &c.CreatedAt, &c.UpdatedAt)
+		&c.Email, &c.SlackWebhookURL, &c.NotificationEnabled, &c.CreatedAt, &c.UpdatedAt)
 	if err != nil {
 		return nil, err
 	}
@@ -75,7 +77,8 @@ func (m *NotificationConfigModel) Remove(ctx context.Context, userID string) (bo

 func (m *NotificationConfigModel) ListEnabled(ctx context.Context) ([]domain.NotificationConfig, error) {
 	rows, err := m.pool.Query(ctx,
-		`SELECT user_id, discord_webhook_url, telegram_chat_id, email
+		`SELECT user_id, discord_webhook_url, telegram_chat_id, telegram_bot_token,
+		        email, slack_webhook_url
 		 FROM user_notification_configs
 		 WHERE notification_enabled = TRUE`,
 	)
@@ -87,7 +90,8 @@ func (m *NotificationConfigModel) ListEnabled(ctx context.Context) ([]domain.Not
 	var configs []domain.NotificationConfig
 	for rows.Next() {
 		var c domain.NotificationConfig
-		if err := rows.Scan(&c.UserID, &c.DiscordWebhookURL, &c.TelegramChatID, &c.Email); err != nil {
+		if err := rows.Scan(&c.UserID, &c.DiscordWebhookURL, &c.TelegramChatID,
+			&c.TelegramBotToken, &c.Email, &c.SlackWebhookURL); err != nil {
 			return nil, err
 		}
 		c.NotificationEnabled = true
--- a/backend-go/internal/notifications/discord.go
+++ b/backend-go/internal/notifications/discord.go
@@ -2,6 +2,7 @@ package notifications

 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"log"
@@ -25,11 +26,15 @@ var discordHTTPClient = &http.Client{ //nolint:gochecknoglobals
 	Timeout: discordHTTPTimeoutSeconds * time.Second,
 }

-type AlertMetadata struct {
-	TxHash       string
-	AddressLabel string
-	AlertType    string
-	Address      string
+// DiscordNotifier sends alert notifications via a Discord webhook.
+type DiscordNotifier struct {
+	WebhookURL string
+}
+
+// Send implements Notifier for Discord.
+func (d *DiscordNotifier) Send(_ context.Context, message string, meta AlertMetadata) error {
+	_, err := SendDiscordNotification(d.WebhookURL, message, meta)
+	return err
 }

 type discordEmbed struct {
--- a/backend-go/internal/notifications/email.go
+++ b/backend-go/internal/notifications/email.go
@@ -0,0 +1,156 @@
+package notifications
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+// EmailNotifier sends alert notifications via email (Resend).
+type EmailNotifier struct {
+	APIKey string
+	From   string
+	To     string
+}
+
+// Send implements Notifier for email.
+func (e *EmailNotifier) Send(_ context.Context, message string, meta AlertMetadata) error {
+	_, err := SendEmailNotification(e.APIKey, e.From, e.To, message, meta)
+	return err
+}
+
+const emailHTTPTimeoutSeconds = 10
+
+var emailHTTPClient = &http.Client{ //nolint:gochecknoglobals
+	Timeout: emailHTTPTimeoutSeconds * time.Second,
+}
+
+type resendPayload struct {
+	From    string `json:"from"`
+	To      string `json:"to"`
+	Subject string `json:"subject"`
+	HTML    string `json:"html"`
+}
+
+func SendEmailNotification(apiKey, fromAddress, toAddress, message string, meta AlertMetadata) (bool, error) {
+	if apiKey == "" {
+		log.Printf("Skipping email notification: RESEND_API_KEY not configured")
+		return false, nil
+	}
+
+	subject := fmt.Sprintf("Koin Ping Alert: %s", alertTypeLabel(meta.AlertType))
+
+	txLink := ""
+	if meta.TxHash != "" {
+		txLink = fmt.Sprintf(
+			`<p><a href="https://etherscan.io/tx/%s">View on Etherscan</a></p>`,
+			meta.TxHash,
+		)
+	}
+
+	html := fmt.Sprintf(`
+<div style="font-family: sans-serif; max-width: 600px; margin: 0 auto;">
+  <h2 style="color: #333;">Koin Ping Alert</h2>
+  <p style="font-size: 16px;">%s</p>
+  <table style="margin: 16px 0; border-collapse: collapse;">
+    <tr>
+      <td style="padding: 4px 12px 4px 0; color: #666;">Address</td>
+      <td style="padding: 4px 0;">%s</td>
+    </tr>
+    <tr>
+      <td style="padding: 4px 12px 4px 0; color: #666;">Blockchain</td>
+      <td style="padding: 4px 0; font-family: monospace; font-size: 13px;">%s</td>
+    </tr>
+  </table>
+  %s
+  <hr style="border: none; border-top: 1px solid #eee; margin: 24px 0;" />
+  <p style="font-size: 12px; color: #999;">Sent by Koin Ping</p>
+</div>`,
+		message, meta.AddressLabel, meta.Address, txLink)
+
+	payload := resendPayload{
+		From:    fromAddress,
+		To:      toAddress,
+		Subject: subject,
+		HTML:    html,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, fmt.Errorf("marshal email payload: %w", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, "https://api.resend.com/emails", bytes.NewReader(body))
+	if err != nil {
+		return false, fmt.Errorf("create email request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+apiKey)
+
+	resp, err := emailHTTPClient.Do(req)
+	if err != nil {
+		log.Printf("Failed to send email notification: %v", err)
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		log.Printf("Resend API failed: HTTP %d", resp.StatusCode)
+		return false, fmt.Errorf("resend API failed: HTTP %d", resp.StatusCode)
+	}
+
+	return true, nil
+}
+
+func TestEmailNotification(apiKey, fromAddress, toAddress string) (bool, error) {
+	if apiKey == "" {
+		return false, fmt.Errorf("email not configured: RESEND_API_KEY not set") //nolint:err113
+	}
+
+	payload := resendPayload{
+		From:    fromAddress,
+		To:      toAddress,
+		Subject: "Koin Ping — Test Notification",
+		HTML:    `<p>Your email alerts are configured correctly!</p><p style="font-size:12px;color:#999;">Sent by Koin Ping</p>`,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, err
+	}
+
+	req, err := http.NewRequest(http.MethodPost, "https://api.resend.com/emails", bytes.NewReader(body))
+	if err != nil {
+		return false, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+apiKey)
+
+	resp, err := emailHTTPClient.Do(req)
+	if err != nil {
+		log.Printf("Email test failed: %v", err)
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	return resp.StatusCode >= 200 && resp.StatusCode < 300, nil
+}
+
+func alertTypeLabel(alertType string) string {
+	switch alertType {
+	case "incoming_tx":
+		return "Incoming Transaction"
+	case "outgoing_tx":
+		return "Outgoing Transaction"
+	case "large_transfer":
+		return "Large Transfer"
+	case "balance_below":
+		return "Balance Below Threshold"
+	default:
+		return "Alert"
+	}
+}
--- a/backend-go/internal/notifications/notifier.go
+++ b/backend-go/internal/notifications/notifier.go
@@ -0,0 +1,16 @@
+package notifications
+
+import "context"
+
+// AlertMetadata holds context about the alert being sent.
+type AlertMetadata struct {
+	TxHash       string
+	AddressLabel string
+	AlertType    string
+	Address      string
+}
+
+// Notifier is the interface implemented by all notification channels.
+type Notifier interface {
+	Send(ctx context.Context, message string, meta AlertMetadata) error
+}
--- a/backend-go/internal/notifications/slack.go
+++ b/backend-go/internal/notifications/slack.go
@@ -0,0 +1,128 @@
+package notifications
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+// SlackNotifier sends alert notifications via a Slack webhook.
+type SlackNotifier struct {
+	WebhookURL string
+}
+
+// Send implements Notifier for Slack.
+func (s *SlackNotifier) Send(_ context.Context, message string, meta AlertMetadata) error {
+	_, err := SendSlackNotification(s.WebhookURL, message, meta)
+	return err
+}
+
+const slackHTTPTimeoutSeconds = 10
+
+var slackHTTPClient = &http.Client{ //nolint:gochecknoglobals
+	Timeout: slackHTTPTimeoutSeconds * time.Second,
+}
+
+type slackAttachment struct {
+	Color  string        `json:"color"`
+	Title  string        `json:"title"`
+	Text   string        `json:"text"`
+	Fields []slackField  `json:"fields"`
+	Footer string        `json:"footer"`
+	Ts     int64         `json:"ts"`
+}
+
+type slackField struct {
+	Title string `json:"title"`
+	Value string `json:"value"`
+	Short bool   `json:"short"`
+}
+
+type slackPayload struct {
+	Text        string            `json:"text,omitempty"`
+	Attachments []slackAttachment `json:"attachments,omitempty"`
+}
+
+func SendSlackNotification(webhookURL, message string, meta AlertMetadata) (bool, error) {
+	fields := []slackField{
+		{Title: "Address", Value: meta.AddressLabel, Short: true},
+		{Title: "Blockchain Address", Value: fmt.Sprintf("`%s`", meta.Address), Short: false},
+	}
+
+	if meta.TxHash != "" {
+		fields = append(fields, slackField{
+			Title: "Transaction",
+			Value: fmt.Sprintf("<https://etherscan.io/tx/%s|View on Etherscan>", meta.TxHash),
+			Short: false,
+		})
+	}
+
+	payload := slackPayload{
+		Attachments: []slackAttachment{
+			{
+				Color:  slackColorForAlertType(meta.AlertType),
+				Title:  "Koin Ping Alert",
+				Text:   message,
+				Fields: fields,
+				Footer: "Koin Ping",
+				Ts:     time.Now().Unix(),
+			},
+		},
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, fmt.Errorf("marshal slack payload: %w", err)
+	}
+
+	resp, err := slackHTTPClient.Post(webhookURL, "application/json", bytes.NewReader(body))
+	if err != nil {
+		log.Printf("Failed to send Slack notification: %v", err)
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		log.Printf("Slack webhook failed: HTTP %d", resp.StatusCode)
+		return false, fmt.Errorf("slack webhook failed: HTTP %d", resp.StatusCode)
+	}
+
+	return true, nil
+}
+
+func TestSlackWebhook(webhookURL string) (bool, error) {
+	payload := slackPayload{
+		Text: "Koin Ping test notification — Your Slack alerts are configured correctly!",
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, err
+	}
+
+	resp, err := slackHTTPClient.Post(webhookURL, "application/json", bytes.NewReader(body))
+	if err != nil {
+		log.Printf("Slack webhook test failed: %v", err)
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	return resp.StatusCode >= 200 && resp.StatusCode < 300, nil
+}
+
+func slackColorForAlertType(alertType string) string {
+	switch alertType {
+	case "incoming_tx":
+		return "#00ff00"
+	case "outgoing_tx":
+		return "#ff9900"
+	case "large_transfer", "balance_below":
+		return "#ff0000"
+	default:
+		return "#0099ff"
+	}
+}
--- a/backend-go/internal/notifications/telegram.go
+++ b/backend-go/internal/notifications/telegram.go
@@ -0,0 +1,122 @@
+package notifications
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+// TelegramNotifier sends alert notifications via Telegram.
+type TelegramNotifier struct {
+	BotToken string
+	ChatID   string
+}
+
+// Send implements Notifier for Telegram.
+func (t *TelegramNotifier) Send(_ context.Context, message string, meta AlertMetadata) error {
+	_, err := SendTelegramNotification(t.BotToken, t.ChatID, message, meta)
+	return err
+}
+
+const telegramHTTPTimeoutSeconds = 10
+
+var telegramHTTPClient = &http.Client{ //nolint:gochecknoglobals
+	Timeout: telegramHTTPTimeoutSeconds * time.Second,
+}
+
+type telegramPayload struct {
+	ChatID    string `json:"chat_id"`
+	Text      string `json:"text"`
+	ParseMode string `json:"parse_mode"`
+}
+
+func SendTelegramNotification(botToken, chatID, message string, meta AlertMetadata) (bool, error) {
+	text := fmt.Sprintf("*Koin Ping Alert*\n\n%s\n\n*Address:* %s\n`%s`",
+		escapeMarkdown(message), escapeMarkdown(meta.AddressLabel), meta.Address)
+
+	if meta.TxHash != "" {
+		text += fmt.Sprintf("\n\n[View on Etherscan](https://etherscan.io/tx/%s)", meta.TxHash)
+	}
+
+	payload := telegramPayload{
+		ChatID:    chatID,
+		Text:      text,
+		ParseMode: "Markdown",
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, fmt.Errorf("marshal telegram payload: %w", err)
+	}
+
+	url := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage", botToken)
+
+	resp, err := telegramHTTPClient.Post(url, "application/json", bytes.NewReader(body))
+	if err != nil {
+		log.Printf("Failed to send Telegram notification: %v", err)
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		log.Printf("Telegram API failed: HTTP %d", resp.StatusCode)
+		return false, fmt.Errorf("telegram API failed: HTTP %d", resp.StatusCode)
+	}
+
+	return true, nil
+}
+
+func TestTelegramWebhook(botToken, chatID string) (bool, error) {
+	payload := telegramPayload{
+		ChatID:    chatID,
+		Text:      "Koin Ping test notification — Your Telegram alerts are configured correctly!",
+		ParseMode: "Markdown",
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, err
+	}
+
+	url := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage", botToken)
+
+	resp, err := telegramHTTPClient.Post(url, "application/json", bytes.NewReader(body))
+	if err != nil {
+		log.Printf("Telegram test failed: %v", err)
+		return false, err
+	}
+	defer resp.Body.Close()
+
+	return resp.StatusCode >= 200 && resp.StatusCode < 300, nil
+}
+
+func escapeMarkdown(s string) string {
+	replacer := []struct{ old, new string }{
+		{"_", "\\_"}, {"*", "\\*"}, {"[", "\\["}, {"]", "\\]"},
+		{"(", "\\("}, {")", "\\)"}, {"~", "\\~"}, {"`", "\\`"},
+		{">", "\\>"}, {"#", "\\#"}, {"+", "\\+"}, {"-", "\\-"},
+		{"=", "\\="}, {"|", "\\|"}, {"{", "\\{"}, {"}", "\\}"},
+		{".", "\\."}, {"!", "\\!"},
+	}
+	result := s
+	for _, r := range replacer {
+		result = replaceAll(result, r.old, r.new)
+	}
+	return result
+}
+
+func replaceAll(s, old, new string) string {
+	out := ""
+	for i := 0; i < len(s); i++ {
+		if string(s[i]) == old {
+			out += new
+		} else {
+			out += string(s[i])
+		}
+	}
+	return out
+}
--- a/backend-go/internal/protocols/ethereum/jsonrpc.go
+++ b/backend-go/internal/protocols/ethereum/jsonrpc.go
@@ -4,7 +4,9 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"log"
 	"math/big"
 	"net/http"
 	"strings"
@@ -13,7 +15,11 @@ import (
 	"github.com/kjannette/koin-ping/backend-go/internal/domain"
 )

-const rpcTimeoutMS = 30000
+const (
+	rpcTimeoutMS    = 30000
+	rpcMaxRetries   = 3
+	rpcRetryBaseMS  = 1000
+)

 type JsonRpcEthereum struct {
 	rpcURL string
@@ -66,6 +72,44 @@ func (j *JsonRpcEthereum) callRPC(ctx context.Context, method string, params ...
 		return nil, fmt.Errorf("marshal RPC request: %w", err)
 	}

+	return j.callWithRetry(ctx, method, body)
+}
+
+// callWithRetry executes a JSON-RPC POST with exponential backoff on transient errors.
+// It retries on network errors, HTTP 429, and HTTP 5xx. It does NOT retry on RPC-level
+// errors or other 4xx responses (those are permanent failures).
+func (j *JsonRpcEthereum) callWithRetry(ctx context.Context, method string, body []byte) (json.RawMessage, error) {
+	var lastErr error
+	for attempt := range rpcMaxRetries {
+		if attempt > 0 {
+			wait := time.Duration(rpcRetryBaseMS*(1<<(attempt-1))) * time.Millisecond
+			select {
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			case <-time.After(wait):
+			}
+			log.Printf("Retrying RPC call [%s] (attempt %d/%d)", method, attempt+1, rpcMaxRetries)
+		}
+
+		result, err := j.doRPCCall(ctx, method, body)
+		if err == nil {
+			return result, nil
+		}
+
+		lastErr = err
+
+		// Permanent errors: do not retry
+		if isPermanentRPCError(err) {
+			return nil, err
+		}
+
+		log.Printf("Transient RPC error [%s] (attempt %d/%d): %v", method, attempt+1, rpcMaxRetries, err)
+	}
+
+	return nil, lastErr
+}
+
+func (j *JsonRpcEthereum) doRPCCall(ctx context.Context, method string, body []byte) (json.RawMessage, error) {
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, j.rpcURL, bytes.NewReader(body))
 	if err != nil {
 		return nil, fmt.Errorf("create RPC request: %w", err)
@@ -78,8 +122,13 @@ func (j *JsonRpcEthereum) callRPC(ctx context.Context, method string, params ...
 	}
 	defer resp.Body.Close()

+	// 429 and 5xx are transient; other non-200 are permanent.
 	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("HTTP %d: %s for %s", resp.StatusCode, resp.Status, method)
+		err := fmt.Errorf("HTTP %d: %s for %s", resp.StatusCode, resp.Status, method)
+		if resp.StatusCode == http.StatusTooManyRequests || resp.StatusCode >= 500 { //nolint:mnd
+			return nil, err // transient — will be retried
+		}
+		return nil, &permanentRPCError{err}
 	}

 	var rpcResp rpcResponse
@@ -88,12 +137,25 @@ func (j *JsonRpcEthereum) callRPC(ctx context.Context, method string, params ...
 	}

 	if rpcResp.Error != nil {
-		return nil, fmt.Errorf("RPC Error [%s]: %s (code: %d)", method, rpcResp.Error.Message, rpcResp.Error.Code)
+		// RPC-level errors are permanent (bad params, unsupported method, etc.)
+		return nil, &permanentRPCError{
+			fmt.Errorf("RPC Error [%s]: %s (code: %d)", method, rpcResp.Error.Message, rpcResp.Error.Code),
+		}
 	}

 	return rpcResp.Result, nil
 }

+type permanentRPCError struct{ cause error }
+
+func (e *permanentRPCError) Error() string { return e.cause.Error() }
+func (e *permanentRPCError) Unwrap() error { return e.cause }
+
+func isPermanentRPCError(err error) bool {
+	var p *permanentRPCError
+	return errors.As(err, &p)
+}
+
 func (j *JsonRpcEthereum) GetLatestBlockNumber(ctx context.Context) (int, error) {
 	result, err := j.callRPC(ctx, "eth_blockNumber")
 	if err != nil {
--- a/backend-go/internal/services/email_digest.go
+++ b/backend-go/internal/services/email_digest.go
@@ -0,0 +1,199 @@
+package services
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+
+	"github.com/kjannette/koin-ping/backend-go/internal/models"
+)
+
+const (
+	resendAPIURL          = "https://api.resend.com/emails"
+	emailHTTPTimeout      = 10 * time.Second
+	defaultDigestMaxItems = 50
+)
+
+var digestHTTPClient = &http.Client{Timeout: emailHTTPTimeout} //nolint:gochecknoglobals
+
+// EmailDigestService handles email setup and digest sending via Resend.
+type EmailDigestService struct {
+	apiKey      string
+	fromAddress string
+	alertEvents *models.AlertEventModel
+	notifCfgs   *models.NotificationConfigModel
+}
+
+func NewEmailDigestService(
+	apiKey, fromAddress string,
+	alertEvents *models.AlertEventModel,
+	notifCfgs *models.NotificationConfigModel,
+) *EmailDigestService {
+	return &EmailDigestService{
+		apiKey:      apiKey,
+		fromAddress: fromAddress,
+		alertEvents: alertEvents,
+		notifCfgs:   notifCfgs,
+	}
+}
+
+// Configured returns true when the Resend API key is present.
+func (s *EmailDigestService) Configured() bool {
+	return s.apiKey != ""
+}
+
+// SetupEmail validates the email works by sending a welcome/confirmation
+// message via Resend. Called when a user saves their email in notification settings.
+func (s *EmailDigestService) SetupEmail(toAddress string) error {
+	if !s.Configured() {
+		return fmt.Errorf("email service not configured: RESEND_API_KEY not set") //nolint:err113
+	}
+
+	html := `
+<div style="font-family: sans-serif; max-width: 600px; margin: 0 auto;">
+  <h2 style="color: #333;">Welcome to Koin Ping Email Alerts</h2>
+  <p>Your email has been successfully configured for alert notifications.</p>
+  <p>You will receive alert digests at this address when events are triggered
+     on your watched addresses.</p>
+  <hr style="border: none; border-top: 1px solid #eee; margin: 24px 0;" />
+  <p style="font-size: 12px; color: #999;">Sent by Koin Ping</p>
+</div>`
+
+	return s.send(toAddress, "Koin Ping — Email Alerts Configured", html)
+}
+
+// SendDigest compiles recent alert events for a user and sends a digest email.
+func (s *EmailDigestService) SendDigest(ctx context.Context, userID, toAddress string) error {
+	if !s.Configured() {
+		return fmt.Errorf("email service not configured: RESEND_API_KEY not set") //nolint:err113
+	}
+
+	events, err := s.alertEvents.ListRecentByUser(ctx, userID, defaultDigestMaxItems)
+	if err != nil {
+		return fmt.Errorf("fetch alert events: %w", err)
+	}
+
+	if len(events) == 0 {
+		log.Printf("No recent alerts for user %s — skipping digest", userID)
+		return nil
+	}
+
+	var rows string
+	for _, e := range events {
+		label := "—"
+		if e.AddressLabel != nil {
+			label = *e.AddressLabel
+		}
+		txLink := "—"
+		if e.TxHash != nil {
+			txLink = fmt.Sprintf(
+				`<a href="https://etherscan.io/tx/%s" style="color:#0066cc;">%s…</a>`,
+				*e.TxHash, (*e.TxHash)[:10],
+			)
+		}
+		rows += fmt.Sprintf(`
+      <tr>
+        <td style="padding:6px 8px; border-bottom:1px solid #eee;">%s</td>
+        <td style="padding:6px 8px; border-bottom:1px solid #eee;">%s</td>
+        <td style="padding:6px 8px; border-bottom:1px solid #eee;">%s</td>
+        <td style="padding:6px 8px; border-bottom:1px solid #eee; font-size:12px; color:#666;">%s</td>
+      </tr>`,
+			label, e.Message, txLink,
+			e.Timestamp.Format("Jan 2 15:04 UTC"),
+		)
+	}
+
+	html := fmt.Sprintf(`
+<div style="font-family: sans-serif; max-width: 700px; margin: 0 auto;">
+  <h2 style="color: #333;">Koin Ping — Alert Digest</h2>
+  <p>Here are your recent alerts (%d total):</p>
+  <table style="width:100%%; border-collapse:collapse; font-size:14px;">
+    <thead>
+      <tr style="background:#f5f5f5;">
+        <th style="padding:8px; text-align:left;">Address</th>
+        <th style="padding:8px; text-align:left;">Alert</th>
+        <th style="padding:8px; text-align:left;">Tx</th>
+        <th style="padding:8px; text-align:left;">Time</th>
+      </tr>
+    </thead>
+    <tbody>%s</tbody>
+  </table>
+  <hr style="border:none; border-top:1px solid #eee; margin:24px 0;" />
+  <p style="font-size:12px; color:#999;">Sent by Koin Ping</p>
+</div>`, len(events), rows)
+
+	subject := fmt.Sprintf("Koin Ping Digest — %d alerts", len(events))
+
+	return s.send(toAddress, subject, html)
+}
+
+// SendDigestsForAllUsers sends a digest email to every user that has
+// notifications enabled and an email configured.
+func (s *EmailDigestService) SendDigestsForAllUsers(ctx context.Context) (int, error) {
+	if !s.Configured() {
+		return 0, nil
+	}
+
+	configs, err := s.notifCfgs.ListEnabled(ctx)
+	if err != nil {
+		return 0, fmt.Errorf("list enabled configs: %w", err)
+	}
+
+	sent := 0
+	for _, cfg := range configs {
+		if cfg.Email == nil || *cfg.Email == "" {
+			continue
+		}
+		if err := s.SendDigest(ctx, cfg.UserID, *cfg.Email); err != nil {
+			log.Printf("Failed to send digest to user %s: %v", cfg.UserID, err)
+			continue
+		}
+		sent++
+	}
+
+	return sent, nil
+}
+
+type resendEmailPayload struct {
+	From    string `json:"from"`
+	To      string `json:"to"`
+	Subject string `json:"subject"`
+	HTML    string `json:"html"`
+}
+
+func (s *EmailDigestService) send(to, subject, html string) error {
+	payload := resendEmailPayload{
+		From:    s.fromAddress,
+		To:      to,
+		Subject: subject,
+		HTML:    html,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("marshal email payload: %w", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, resendAPIURL, bytes.NewReader(body))
+	if err != nil {
+		return fmt.Errorf("create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+s.apiKey)
+
+	resp, err := digestHTTPClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("send email via Resend: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return fmt.Errorf("Resend API returned HTTP %d", resp.StatusCode) //nolint:err113
+	}
+
+	return nil
+}
--- a/backend-go/internal/services/evaluator.go
+++ b/backend-go/internal/services/evaluator.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"time"

 	"github.com/kjannette/koin-ping/backend-go/internal/domain"
 	"github.com/kjannette/koin-ping/backend-go/internal/models"
@@ -12,12 +13,20 @@ import (
 	"github.com/kjannette/koin-ping/backend-go/internal/wei"
 )

+const (
+	notificationTimeout    = 30 * time.Second
+	notificationMaxRetries = 3
+	notificationRetryBase  = time.Second
+)
+
 type EvaluatorService struct {
 	eth          ethereum.EthereumObserver
 	alertRules   *models.AlertRuleModel
 	alertEvents  *models.AlertEventModel
 	addresses    *models.AddressModel
 	notifConfigs *models.NotificationConfigModel
+	resendAPIKey string
+	emailFrom    string
 }

 func NewEvaluatorService(
@@ -26,6 +35,8 @@ func NewEvaluatorService(
 	alertEvents *models.AlertEventModel,
 	addresses *models.AddressModel,
 	notifConfigs *models.NotificationConfigModel,
+	resendAPIKey string,
+	emailFrom string,
 ) *EvaluatorService {
 	return &EvaluatorService{
 		eth:          eth,
@@ -33,6 +44,8 @@ func NewEvaluatorService(
 		alertEvents:  alertEvents,
 		addresses:    addresses,
 		notifConfigs: notifConfigs,
+		resendAPIKey: resendAPIKey,
+		emailFrom:    emailFrom,
 	}
 }

@@ -161,25 +174,85 @@ func (s *EvaluatorService) fireAlert(ctx context.Context, rule domain.AlertRule,
 	message := s.buildMessage(rule, obs)
 	txHash := &obs.Hash

-	_, err = s.alertEvents.Create(ctx, rule.ID, message, &addressLabel, txHash)
+	event, err := s.alertEvents.Create(ctx, rule.ID, message, &addressLabel, txHash)
 	if err != nil {
 		return err
 	}

+	if event == nil {
+		log.Printf("[ALERT DEDUP] Rule %d (%s) - duplicate event skipped for TX: %s", rule.ID, rule.Type, obs.Hash)
+		return nil
+	}
+
 	log.Printf("[ALERT FIRED] Rule %d (%s) - %s - TX: %s", rule.ID, rule.Type, message, obs.Hash)

-	// Send Discord notification (non-fatal on failure)
 	if addr != nil {
+		userID := addr.UserID
+		address := addr.Address
 		go func() {
-			s.sendNotification(
-				ctx, addr.UserID, message, obs, addressLabel, rule, addr.Address,
-			)
+			notifCtx, cancel := context.WithTimeout(context.Background(), notificationTimeout)
+			defer cancel()
+			s.sendNotification(notifCtx, userID, message, obs, addressLabel, rule, address)
 		}()
 	}

 	return nil
 }

+func (s *EvaluatorService) buildNotifiers(cfg *domain.NotificationConfig) []notifications.Notifier {
+	var notifiers []notifications.Notifier
+
+	if cfg.DiscordWebhookURL != nil && *cfg.DiscordWebhookURL != "" {
+		notifiers = append(notifiers, &notifications.DiscordNotifier{WebhookURL: *cfg.DiscordWebhookURL})
+	}
+
+	if cfg.TelegramBotToken != nil && *cfg.TelegramBotToken != "" &&
+		cfg.TelegramChatID != nil && *cfg.TelegramChatID != "" {
+		notifiers = append(notifiers, &notifications.TelegramNotifier{
+			BotToken: *cfg.TelegramBotToken,
+			ChatID:   *cfg.TelegramChatID,
+		})
+	}
+
+	if cfg.SlackWebhookURL != nil && *cfg.SlackWebhookURL != "" {
+		notifiers = append(notifiers, &notifications.SlackNotifier{WebhookURL: *cfg.SlackWebhookURL})
+	}
+
+	if cfg.Email != nil && *cfg.Email != "" {
+		notifiers = append(notifiers, &notifications.EmailNotifier{
+			APIKey: s.resendAPIKey,
+			From:   s.emailFrom,
+			To:     *cfg.Email,
+		})
+	}
+
+	return notifiers
+}
+
+func sendWithRetry(ctx context.Context, n notifications.Notifier, message string, meta notifications.AlertMetadata) error {
+	var lastErr error
+	for attempt := range notificationMaxRetries {
+		if attempt > 0 {
+			wait := notificationRetryBase * time.Duration(1<<(attempt-1))
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case <-time.After(wait):
+			}
+		}
+
+		if err := n.Send(ctx, message, meta); err != nil {
+			log.Printf("Notification attempt %d/%d failed: %v", attempt+1, notificationMaxRetries, err)
+			lastErr = err
+			continue
+		}
+
+		return nil
+	}
+
+	return lastErr
+}
+
 func (s *EvaluatorService) sendNotification(ctx context.Context, userID, message string, obs domain.ObservedTx, addressLabel string, rule domain.AlertRule, address string) {
 	notifConfig, err := s.notifConfigs.GetConfig(ctx, userID)
 	if err != nil {
@@ -187,25 +260,23 @@ func (s *EvaluatorService) sendNotification(ctx context.Context, userID, message
 		return
 	}

-	if notifConfig == nil || !notifConfig.NotificationEnabled || notifConfig.DiscordWebhookURL == nil {
+	if notifConfig == nil || !notifConfig.NotificationEnabled {
 		return
 	}

-	sent, err := notifications.SendDiscordNotification(
-		*notifConfig.DiscordWebhookURL,
-		message,
-		notifications.AlertMetadata{
-			TxHash:       obs.Hash,
-			AddressLabel: addressLabel,
-			AlertType:    string(rule.Type),
-			Address:      address,
-		},
-	)
+	meta := notifications.AlertMetadata{
+		TxHash:       obs.Hash,
+		AddressLabel: addressLabel,
+		AlertType:    string(rule.Type),
+		Address:      address,
+	}

-	if err != nil || !sent {
-		log.Printf("Discord notification failed for user %s: %v", userID, err)
-	} else {
-		log.Printf("Discord notification sent to user %s", userID)
+	for _, n := range s.buildNotifiers(notifConfig) {
+		if err := sendWithRetry(ctx, n, message, meta); err != nil {
+			log.Printf("Notification channel failed for user %s after retries: %v", userID, err)
+		} else {
+			log.Printf("Notification sent to user %s via %T", userID, n)
+		}
 	}
 }

--- a/frontend/src/api/addresses.jsx
+++ b/frontend/src/api/addresses.jsx
@@ -80,6 +80,41 @@ export async function getAddresses() {
    }
 }

+/**
+ * Update an address (e.g. change its label)
+ * @param {number} addressId - Address ID to update
+ * @param {Object} data - Fields to update (e.g. { label: "New Label" })
+ * @returns {Promise<Object>} Updated address
+ */
+export async function updateAddress(addressId, data) {
+    try {
+        const headers = await getAuthHeaders();
+        const response = await fetch(`${API_BASE}/addresses/${addressId}`, {
+            method: "PATCH",
+            headers: headers,
+            body: JSON.stringify(data),
+        });
+
+        if (!response.ok) {
+            let errorMessage = "Failed to update address";
+            try {
+                const error = await response.json();
+                errorMessage = error.message || errorMessage;
+            } catch {
+                errorMessage = `Server error: ${response.status} ${response.statusText}`;
+            }
+            throw new Error(errorMessage);
+        }
+
+        return response.json();
+    } catch (error) {
+        if (error.message.includes("fetch")) {
+            throw new Error("Cannot connect to server. Is the backend running?");
+        }
+        throw error;
+    }
+}
+
 /**
 * Delete a tracked address
 * @param {number} addressId - Address ID to delete
--- a/frontend/src/api/notificationConfig.jsx
+++ b/frontend/src/api/notificationConfig.jsx
@@ -1,5 +1,3 @@
-// API client for notification configuration
-
 import { getAuthHeaders } from "./authHeaders";
 import { API_BASE } from "./config";

@@ -38,11 +36,13 @@ export async function getNotificationConfig() {

 /**
 * Update notification configuration
- * @param {Object} config - Configuration to update
- * @param {string} [config.discord_webhook_url] - Discord webhook URL
- * @param {string} [config.telegram_chat_id] - Telegram chat ID
- * @param {string} [config.email] - Email address
- * @param {boolean} [config.notification_enabled] - Enable/disable notifications
+ * @param {Object} config
+ * @param {string} [config.discord_webhook_url]
+ * @param {string} [config.telegram_chat_id]
+ * @param {string} [config.telegram_bot_token]
+ * @param {string} [config.email]
+ * @param {string} [config.slack_webhook_url]
+ * @param {boolean} [config.notification_enabled]
 * @returns {Promise<Object>} Updated config
 */
 export async function updateNotificationConfig(config) {
@@ -77,27 +77,107 @@ export async function updateNotificationConfig(config) {
 }

 /**
- * Test a Discord webhook URL
- * Sends a test message to verify the webhook works
- * @param {string} webhookUrl - Discord webhook URL to test
- * @returns {Promise<boolean>} True if test successful
+ * Set up email notifications via Resend.
+ * Reads the user's saved email from their config and sends a confirmation.
+ * @returns {Promise<Object>} Setup result
 */
-export async function testDiscordWebhook(webhookUrl) {
+export async function setupEmail() {
    try {
-        const payload = {
-            content:
-                "Koin Ping test notification - Your Discord webhook is configured correctly!",
-        };
-
-        const response = await fetch(webhookUrl, {
+        const headers = await getAuthHeaders();
+        const response = await fetch(`${API_BASE}/email/setup`, {
            method: "POST",
-            headers: { "Content-Type": "application/json" },
-            body: JSON.stringify(payload),
+            headers: headers,
        });

-        return response.ok;
+        if (!response.ok) {
+            let errorMessage = "Failed to set up email";
+            try {
+                const error = await response.json();
+                errorMessage = error.message || errorMessage;
+            } catch {
+                errorMessage = `Server error: ${response.status} ${response.statusText}`;
+            }
+            throw new Error(errorMessage);
+        }
+
+        return response.json();
    } catch (error) {
-        console.error("Discord webhook test failed:", error);
-        return false;
+        if (error.message.includes("fetch")) {
+            throw new Error(
+                "Cannot connect to server. Is the backend running?",
+            );
+        }
+        throw error;
+    }
+}
+
+/**
+ * Send an alert digest email to the user's configured email address.
+ * @returns {Promise<Object>} Digest send result
+ */
+export async function sendEmailDigest() {
+    try {
+        const headers = await getAuthHeaders();
+        const response = await fetch(`${API_BASE}/email/digest`, {
+            method: "POST",
+            headers: headers,
+        });
+
+        if (!response.ok) {
+            let errorMessage = "Failed to send digest";
+            try {
+                const error = await response.json();
+                errorMessage = error.message || errorMessage;
+            } catch {
+                errorMessage = `Server error: ${response.status} ${response.statusText}`;
+            }
+            throw new Error(errorMessage);
+        }
+
+        return response.json();
+    } catch (error) {
+        if (error.message.includes("fetch")) {
+            throw new Error(
+                "Cannot connect to server. Is the backend running?",
+            );
+        }
+        throw error;
+    }
+}
+
+/**
+ * Test all configured notification channels via the backend
+ * @returns {Promise<Object>} Results per channel
+ */
+export async function testNotificationChannels() {
+    try {
+        const headers = await getAuthHeaders();
+        const response = await fetch(
+            `${API_BASE}/notification-config/test`,
+            {
+                method: "POST",
+                headers: headers,
+            },
+        );
+
+        if (!response.ok) {
+            let errorMessage = "Failed to test notification channels";
+            try {
+                const error = await response.json();
+                errorMessage = error.message || errorMessage;
+            } catch {
+                errorMessage = `Server error: ${response.status} ${response.statusText}`;
+            }
+            throw new Error(errorMessage);
+        }
+
+        return response.json();
+    } catch (error) {
+        if (error.message.includes("fetch")) {
+            throw new Error(
+                "Cannot connect to server. Is the backend running?",
+            );
+        }
+        throw error;
    }
 }
--- a/frontend/src/pages/Addresses.jsx
+++ b/frontend/src/pages/Addresses.jsx
@@ -1,11 +1,13 @@
 import { useState, useEffect } from "react";
 import AddressForm from "../components/AddressForm";
-import { getAddresses, createAddress } from "../api/addresses";
+import { getAddresses, createAddress, deleteAddress, updateAddress } from "../api/addresses";

 export default function Addresses() {
    const [addresses, setAddresses] = useState([]);
    const [loading, setLoading] = useState(true);
    const [error, setError] = useState(null);
+    const [editingId, setEditingId] = useState(null);
+    const [editLabel, setEditLabel] = useState("");

    // Load addresses on mount
    useEffect(() => {
@@ -29,15 +31,52 @@ export default function Addresses() {
    async function handleAddressSubmit(data) {
        try {
            const newAddress = await createAddress(data);
-            // Append new address to state
            setAddresses((prev) => [...prev, newAddress]);
-            setError(null); // Clear any previous errors
+            setError(null);
        } catch (err) {
            setError(err.message);
            console.error("Failed to create address:", err);
        }
    }

+    async function handleDelete(id, label) {
+        const displayName = label || "this address";
+        if (!window.confirm(`Remove "${displayName}"? This will also delete all associated alert rules.`)) {
+            return;
+        }
+        try {
+            await deleteAddress(id);
+            setAddresses((prev) => prev.filter((a) => a.id !== id));
+            setError(null);
+        } catch (err) {
+            setError(err.message);
+            console.error("Failed to delete address:", err);
+        }
+    }
+
+    function handleEditStart(addr) {
+        setEditingId(addr.id);
+        setEditLabel(addr.label ?? "");
+    }
+
+    async function handleEditSave(id) {
+        try {
+            const updated = await updateAddress(id, { label: editLabel || null });
+            setAddresses((prev) => prev.map((a) => (a.id === id ? updated : a)));
+            setEditingId(null);
+            setEditLabel("");
+            setError(null);
+        } catch (err) {
+            setError(err.message);
+            console.error("Failed to update address:", err);
+        }
+    }
+
+    function handleEditCancel() {
+        setEditingId(null);
+        setEditLabel("");
+    }
+
    return (
        <div style={{ maxWidth: "800px", margin: "0 auto", padding: "2rem" }}>
            <h1>Tracked Addresses</h1>
@@ -68,22 +107,88 @@ export default function Addresses() {
                                    backgroundColor: "#333",
                                }}
                            >
-                                <div
-                                    style={{
-                                        fontWeight: "bold",
-                                        marginBottom: "0.25rem",
-                                    }}
-                                >
-                                    {addr.label || "Unlabeled"}
-                                </div>
-                                <div
-                                    style={{
-                                        fontFamily: "monospace",
-                                        fontSize: "1.035rem",
-                                        color: "#b3b3b3",
-                                    }}
-                                >
-                                    {addr.address}
+                                <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
+                                    <div style={{ flex: 1 }}>
+                                        {editingId === addr.id ? (
+                                            <div style={{ display: "flex", gap: "0.5rem", alignItems: "center", marginBottom: "0.25rem" }}>
+                                                <input
+                                                    value={editLabel}
+                                                    onChange={(e) => setEditLabel(e.target.value)}
+                                                    placeholder="Label (optional)"
+                                                    style={{
+                                                        background: "#444",
+                                                        border: "1px solid #666",
+                                                        borderRadius: "3px",
+                                                        color: "#fff",
+                                                        padding: "0.25rem 0.5rem",
+                                                        fontSize: "0.9rem",
+                                                    }}
+                                                    onKeyDown={(e) => {
+                                                        if (e.key === "Enter") handleEditSave(addr.id);
+                                                        if (e.key === "Escape") handleEditCancel();
+                                                    }}
+                                                    autoFocus
+                                                />
+                                                <button
+                                                    onClick={() => handleEditSave(addr.id)}
+                                                    style={{ cursor: "pointer", padding: "0.25rem 0.6rem", fontSize: "0.85rem" }}
+                                                >
+                                                    Save
+                                                </button>
+                                                <button
+                                                    onClick={handleEditCancel}
+                                                    style={{ cursor: "pointer", padding: "0.25rem 0.6rem", fontSize: "0.85rem", background: "transparent", color: "#aaa", border: "1px solid #555" }}
+                                                >
+                                                    Cancel
+                                                </button>
+                                            </div>
+                                        ) : (
+                                            <div style={{ display: "flex", alignItems: "center", gap: "0.5rem", marginBottom: "0.25rem" }}>
+                                                <span style={{ fontWeight: "bold" }}>
+                                                    {addr.label || "Unlabeled"}
+                                                </span>
+                                                <button
+                                                    onClick={() => handleEditStart(addr)}
+                                                    style={{
+                                                        cursor: "pointer",
+                                                        background: "transparent",
+                                                        border: "none",
+                                                        color: "#6699cc",
+                                                        fontSize: "0.8rem",
+                                                        padding: "0",
+                                                        textDecoration: "underline",
+                                                    }}
+                                                >
+                                                    Edit
+                                                </button>
+                                            </div>
+                                        )}
+                                        <div
+                                            style={{
+                                                fontFamily: "monospace",
+                                                fontSize: "1.035rem",
+                                                color: "#b3b3b3",
+                                            }}
+                                        >
+                                            {addr.address}
+                                        </div>
+                                    </div>
+                                    <button
+                                        onClick={() => handleDelete(addr.id, addr.label)}
+                                        style={{
+                                            cursor: "pointer",
+                                            background: "transparent",
+                                            border: "1px solid #884444",
+                                            color: "#cc6666",
+                                            borderRadius: "3px",
+                                            padding: "0.3rem 0.7rem",
+                                            fontSize: "0.85rem",
+                                            marginLeft: "1rem",
+                                            flexShrink: 0,
+                                        }}
+                                    >
+                                        Remove
+                                    </button>
                                </div>
                            </li>
                        ))}
--- a/frontend/src/pages/Alerts.jsx
+++ b/frontend/src/pages/Alerts.jsx
@@ -1,7 +1,6 @@
 import { useState, useEffect } from "react";
 import AlertForm from "../components/AlertForm";
 import Button from "../components/Button";
-import Input from "../components/Input";
 import { getAddresses } from "../api/addresses";
 import {
    getAlerts,
@@ -12,9 +11,40 @@ import {
 import {
    getNotificationConfig,
    updateNotificationConfig,
-    testDiscordWebhook,
+    testNotificationChannels,
+    setupEmail,
+    sendEmailDigest,
 } from "../api/notificationConfig";

+const inputStyle = {
+    width: "100%",
+    padding: "0.5rem",
+    fontSize: "0.9rem",
+    backgroundColor: "#1a1a1a",
+    border: "1px solid #444",
+    borderRadius: "4px",
+    color: "white",
+    fontFamily: "monospace",
+    boxSizing: "border-box",
+};
+
+const labelStyle = {
+    display: "block",
+    marginBottom: "0.25rem",
+    fontSize: "0.9rem",
+    color: "#ccc",
+};
+
+const helpLinkStyle = { color: "#0066cc", fontSize: "0.85rem" };
+
+const sectionStyle = {
+    marginBottom: "1.5rem",
+    padding: "1rem",
+    backgroundColor: "#2a2a2a",
+    borderRadius: "6px",
+    border: "1px solid #3a3a3a",
+};
+
 export default function Alerts() {
    const [addresses, setAddresses] = useState([]);
    const [selectedAddressId, setSelectedAddressId] = useState(null);
@@ -23,34 +53,48 @@ export default function Alerts() {
    const [error, setError] = useState(null);

    // Notification config state
-    const [notificationConfig, setNotificationConfig] = useState(null);
+    const [notificationEnabled, setNotificationEnabled] = useState(false);
    const [discordWebhookUrl, setDiscordWebhookUrl] = useState("");
-    const [notificationEnabled, setNotificationEnabled] = useState(true);
+    const [telegramBotToken, setTelegramBotToken] = useState("");
+    const [telegramChatId, setTelegramChatId] = useState("");
+    const [email, setEmail] = useState("");
+    const [slackWebhookUrl, setSlackWebhookUrl] = useState("");
    const [notificationLoading, setNotificationLoading] = useState(false);
    const [notificationError, setNotificationError] = useState(null);
    const [notificationSuccess, setNotificationSuccess] = useState(null);
-    const [testingWebhook, setTestingWebhook] = useState(false);
+    const [testingChannels, setTestingChannels] = useState(false);
+    const [settingUpEmail, setSettingUpEmail] = useState(false);
+    const [sendingDigest, setSendingDigest] = useState(false);
+    const [hasExistingConfig, setHasExistingConfig] = useState(false);

-    // Load addresses and notification config on mount
    useEffect(() => {
        async function fetchData() {
            try {
                setLoading(true);

-                // Fetch addresses
                const addressData = await getAddresses();
                setAddresses(addressData);
                if (addressData.length > 0) {
                    setSelectedAddressId(addressData[0].id);
                }

-                // Fetch notification config
                const configData = await getNotificationConfig();
-                setNotificationConfig(configData);
-                setDiscordWebhookUrl(configData.discord_webhook_url || "");
                setNotificationEnabled(
                    configData.notification_enabled !== false,
                );
+                setDiscordWebhookUrl(configData.discord_webhook_url || "");
+                setTelegramBotToken(configData.telegram_bot_token || "");
+                setTelegramChatId(configData.telegram_chat_id || "");
+                setEmail(configData.email || "");
+                setSlackWebhookUrl(configData.slack_webhook_url || "");
+
+                const hasSaved =
+                    !!configData.discord_webhook_url ||
+                    !!configData.telegram_bot_token ||
+                    !!configData.telegram_chat_id ||
+                    !!configData.email ||
+                    !!configData.slack_webhook_url;
+                setHasExistingConfig(hasSaved);
            } catch (err) {
                setError(err.message);
                console.error("Failed to fetch data:", err);
@@ -62,7 +106,6 @@ export default function Alerts() {
        fetchData();
    }, []);

-    // Load alerts when address is selected
    useEffect(() => {
        if (!selectedAddressId) {
            setAlerts([]);
@@ -73,7 +116,7 @@ export default function Alerts() {
            try {
                const data = await getAlerts(selectedAddressId);
                setAlerts(data);
-                setError(null); // Clear any previous errors
+                setError(null);
            } catch (err) {
                setError(err.message);
                console.error("Failed to fetch alerts:", err);
@@ -83,63 +126,68 @@ export default function Alerts() {
        fetchAlerts();
    }, [selectedAddressId]);

-    // Handle new alert submission
    async function handleAlertSubmit(data) {
        if (!selectedAddressId) return;

        try {
            const newAlert = await createAlert(selectedAddressId, data);
            setAlerts((prev) => [...prev, newAlert]);
-            setError(null); // Clear any previous errors
+            setError(null);
        } catch (err) {
            setError(err.message);
            console.error("Failed to create alert:", err);
        }
    }

-    // Toggle alert enabled/disabled
    async function handleToggleAlert(alertId, currentStatus) {
        try {
            const updated = await updateAlertStatus(alertId, !currentStatus);
            setAlerts((prev) =>
                prev.map((alert) => (alert.id === alertId ? updated : alert)),
            );
-            setError(null); // Clear any previous errors
+            setError(null);
        } catch (err) {
            setError(err.message);
            console.error("Failed to update alert:", err);
        }
    }

-    // Delete alert
    async function handleDeleteAlert(alertId) {
        try {
            await deleteAlert(alertId);
            setAlerts((prev) => prev.filter((alert) => alert.id !== alertId));
-            setError(null); // Clear any previous errors
+            setError(null);
        } catch (err) {
            setError(err.message);
            console.error("Failed to delete alert:", err);
        }
    }

-    // Save notification config
    async function handleSaveNotificationConfig() {
+        if (hasExistingConfig) {
+            const confirmed = window.confirm(
+                "This will overwrite your previously saved notification settings. Continue?",
+            );
+            if (!confirmed) return;
+        }
+
        try {
            setNotificationLoading(true);
            setNotificationError(null);
            setNotificationSuccess(null);

            const config = {
-                discord_webhook_url: discordWebhookUrl || null,
                notification_enabled: notificationEnabled,
+                discord_webhook_url: discordWebhookUrl || null,
+                telegram_bot_token: telegramBotToken || null,
+                telegram_chat_id: telegramChatId || null,
+                email: email || null,
+                slack_webhook_url: slackWebhookUrl || null,
            };

-            const updated = await updateNotificationConfig(config);
-            setNotificationConfig(updated);
+            await updateNotificationConfig(config);
+            setHasExistingConfig(true);
            setNotificationSuccess("Notification settings saved!");
-
-            // Clear success message after 3 seconds
            setTimeout(() => setNotificationSuccess(null), 3000);
        } catch (err) {
            setNotificationError(err.message);
@@ -149,32 +197,76 @@ export default function Alerts() {
        }
    }

-    // Test Discord webhook
-    async function handleTestWebhook() {
-        if (!discordWebhookUrl) {
-            setNotificationError("Please enter a Discord webhook URL first");
-            return;
-        }
-
+    async function handleTestChannels() {
        try {
-            setTestingWebhook(true);
+            setTestingChannels(true);
            setNotificationError(null);
            setNotificationSuccess(null);

-            const success = await testDiscordWebhook(discordWebhookUrl);
+            const data = await testNotificationChannels();
+            const results = data.results || [];

-            if (success) {
+            const failed = results.filter((r) => !r.success);
+            const succeeded = results.filter((r) => r.success);
+
+            if (failed.length === 0 && succeeded.length > 0) {
                setNotificationSuccess(
-                    "Test notification sent! Check your Discord channel.",
+                    `Test sent to: ${succeeded.map((r) => r.channel).join(", ")}`,
+                );
+            } else if (failed.length > 0 && succeeded.length > 0) {
+                setNotificationSuccess(
+                    `Sent: ${succeeded.map((r) => r.channel).join(", ")}. Failed: ${failed.map((r) => `${r.channel} (${r.error})`).join(", ")}`,
+                );
+            } else if (failed.length > 0) {
+                setNotificationError(
+                    `Test failed: ${failed.map((r) => `${r.channel} (${r.error})`).join(", ")}`,
                );
-                setTimeout(() => setNotificationSuccess(null), 5000);
-            } else {
-                setNotificationError("Test failed. Check your webhook URL.");
            }
+
+            setTimeout(() => {
+                setNotificationSuccess(null);
+                setNotificationError(null);
+            }, 6000);
        } catch (err) {
-            setNotificationError("Test failed: " + err.message);
+            setNotificationError(err.message);
        } finally {
-            setTestingWebhook(false);
+            setTestingChannels(false);
+        }
+    }
+
+    async function handleSetupEmail() {
+        try {
+            setSettingUpEmail(true);
+            setNotificationError(null);
+            setNotificationSuccess(null);
+
+            await handleSaveNotificationConfig();
+
+            const result = await setupEmail();
+            setNotificationSuccess(
+                result.message || "Confirmation email sent!",
+            );
+            setTimeout(() => setNotificationSuccess(null), 5000);
+        } catch (err) {
+            setNotificationError(err.message);
+        } finally {
+            setSettingUpEmail(false);
+        }
+    }
+
+    async function handleSendDigest() {
+        try {
+            setSendingDigest(true);
+            setNotificationError(null);
+            setNotificationSuccess(null);
+
+            const result = await sendEmailDigest();
+            setNotificationSuccess(result.message || "Digest email sent!");
+            setTimeout(() => setNotificationSuccess(null), 5000);
+        } catch (err) {
+            setNotificationError(err.message);
+        } finally {
+            setSendingDigest(false);
        }
    }

@@ -201,19 +293,18 @@ export default function Alerts() {
                Alert Rules & Notifications
            </h1>

-            {/* Two-column layout */}
            <div
                style={{
                    display: "grid",
                    gridTemplateColumns: "1fr 1fr",
                    gap: "2rem",
+                    alignItems: "start",
                }}
            >
                {/* LEFT COLUMN: Alert Rules */}
                <div>
                    <h2 style={{ marginTop: 0 }}>Alert Rules</h2>

-                    {/* Address selector */}
                    <div style={{ marginBottom: "2rem" }}>
                        <label
                            style={{ display: "block", marginBottom: "0.5rem" }}
@@ -245,7 +336,6 @@ export default function Alerts() {

                    {selectedAddress && (
                        <>
-                            {/* Current address info */}
                            <div
                                style={{
                                    padding: "1rem",
@@ -282,13 +372,11 @@ export default function Alerts() {
                                </div>
                            </div>

-                            {/* Alert creation form */}
                            <div style={{ marginBottom: "2rem" }}>
                                <h3>Create New Alert</h3>
                                <AlertForm onSubmit={handleAlertSubmit} />
                            </div>

-                            {/* Existing alerts list */}
                            <div>
                                <h3>Active Alert Rules</h3>
                                {error && (
@@ -316,7 +404,7 @@ export default function Alerts() {
                                                    marginBottom: "0.5rem",
                                                    border: "1px solid #444",
                                                    borderRadius: "4px",
-                                                                    backgroundColor: "#333",
+                                                    backgroundColor: "#333",
                                                    opacity: alert.enabled
                                                        ? 1
                                                        : 0.6,
@@ -449,7 +537,7 @@ export default function Alerts() {
                    {/* Master toggle */}
                    <div
                        style={{
-                            marginBottom: "2rem",
+                            marginBottom: "1.5rem",
                            padding: "1rem",
                            backgroundColor: "#333",
                            borderRadius: "4px",
@@ -490,57 +578,208 @@ export default function Alerts() {
                        </div>
                    </div>

-                    {/* Discord Section */}
-                    <div style={{ marginBottom: "2rem" }}>
-                        <h3 style={{ marginBottom: "1rem" }}>Discord</h3>
+                    {/* All channel settings — hidden when master toggle is off */}
+                    <div
+                        style={{
+                            display: notificationEnabled ? "block" : "none",
+                        }}
+                    >
+                        {/* Telegram */}
+                        <div style={sectionStyle}>
+                            <h3 style={{ marginTop: 0, marginBottom: "1rem" }}>
+                                Telegram
+                            </h3>

-                        <div style={{ marginBottom: "1rem" }}>
-                            <label
-                                style={{
-                                    display: "block",
-                                    marginBottom: "0.5rem",
-                                }}
+                            <div style={{ marginBottom: "0.75rem" }}>
+                                <label style={labelStyle}>Bot Token</label>
+                                <input
+                                    type="text"
+                                    value={telegramBotToken}
+                                    onChange={(e) =>
+                                        setTelegramBotToken(e.target.value)
+                                    }
+                                    placeholder="123456789:ABCdefGHIjklMNOpqrSTUvwxYZ"
+                                    style={inputStyle}
+                                />
+                            </div>
+
+                            <div style={{ marginBottom: "0.5rem" }}>
+                                <label style={labelStyle}>Chat ID</label>
+                                <input
+                                    type="text"
+                                    value={telegramChatId}
+                                    onChange={(e) =>
+                                        setTelegramChatId(e.target.value)
+                                    }
+                                    placeholder="-1001234567890"
+                                    style={inputStyle}
+                                />
+                            </div>
+
+                            <a
+                                href="https://core.telegram.org/bots#how-do-i-create-a-bot"
+                                target="_blank"
+                                rel="noopener noreferrer"
+                                style={helpLinkStyle}
                            >
-                                Discord Webhook URL
-                            </label>
-                            <input
-                                type="text"
-                                value={discordWebhookUrl}
-                                onChange={(e) =>
-                                    setDiscordWebhookUrl(e.target.value)
-                                }
-                                placeholder="https://discord.com/api/webhooks/..."
-                                style={{
-                                    width: "100%",
-                                    padding: "0.5rem",
-                                    fontSize: "1rem",
-                                    backgroundColor: "#1a1a1a",
-                                    border: "1px solid #444",
-                                    borderRadius: "4px",
-                                    color: "white",
-                                    fontFamily: "monospace",
-                                    fontSize: "0.9rem",
-                                }}
-                            />
+                                How to create a Telegram bot & get your Chat ID
+                            </a>
+                        </div>
+
+                        {/* Email */}
+                        <div style={sectionStyle}>
+                            <h3 style={{ marginTop: 0, marginBottom: "1rem" }}>
+                                Email
+                            </h3>
+
+                            <div style={{ marginBottom: "0.75rem" }}>
+                                <label style={labelStyle}>Email Address</label>
+                                <input
+                                    type="email"
+                                    value={email}
+                                    onChange={(e) => setEmail(e.target.value)}
+                                    placeholder="you@example.com"
+                                    style={inputStyle}
+                                />
+                            </div>
+
                            <div
                                style={{
-                                    fontSize: "0.978rem",
-                                    color: "#b3b3b3",
-                                    marginTop: "0.5rem",
+                                    fontSize: "0.85rem",
+                                    color: "#808080",
+                                    marginBottom: "0.75rem",
                                }}
                            >
-                                <a
-                                    href="https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks"
-                                    target="_blank"
-                                    rel="noopener noreferrer"
-                                    style={{ color: "#0066cc" }}
+                                Alert notifications and digests will be sent to
+                                this address
+                            </div>
+
+                            <div
+                                style={{
+                                    display: "flex",
+                                    gap: "0.5rem",
+                                }}
+                            >
+                                <button
+                                    onClick={handleSetupEmail}
+                                    disabled={settingUpEmail || !email}
+                                    style={{
+                                        padding: "0.5rem 1rem",
+                                        fontSize: "0.85rem",
+                                        backgroundColor:
+                                            settingUpEmail || !email
+                                                ? "#333"
+                                                : "#0066cc",
+                                        color: "white",
+                                        border: "none",
+                                        borderRadius: "4px",
+                                        cursor:
+                                            settingUpEmail || !email
+                                                ? "not-allowed"
+                                                : "pointer",
+                                    }}
                                >
-                                    How to get a Discord webhook URL
-                                </a>
+                                    {settingUpEmail
+                                        ? "Setting up..."
+                                        : "Verify Email"}
+                                </button>
+
+                                <button
+                                    onClick={handleSendDigest}
+                                    disabled={sendingDigest || !email}
+                                    style={{
+                                        padding: "0.5rem 1rem",
+                                        fontSize: "0.85rem",
+                                        backgroundColor:
+                                            sendingDigest || !email
+                                                ? "#333"
+                                                : "#6c757d",
+                                        color: "white",
+                                        border: "none",
+                                        borderRadius: "4px",
+                                        cursor:
+                                            sendingDigest || !email
+                                                ? "not-allowed"
+                                                : "pointer",
+                                    }}
+                                >
+                                    {sendingDigest
+                                        ? "Sending..."
+                                        : "Send Digest Now"}
+                                </button>
                            </div>
                        </div>

-                        <div style={{ display: "flex", gap: "0.5rem" }}>
+                        {/* Discord */}
+                        <div style={sectionStyle}>
+                            <h3 style={{ marginTop: 0, marginBottom: "1rem" }}>
+                                Discord
+                            </h3>
+
+                            <div style={{ marginBottom: "0.5rem" }}>
+                                <label style={labelStyle}>
+                                    Discord Webhook URL
+                                </label>
+                                <input
+                                    type="text"
+                                    value={discordWebhookUrl}
+                                    onChange={(e) =>
+                                        setDiscordWebhookUrl(e.target.value)
+                                    }
+                                    placeholder="https://discord.com/api/webhooks/..."
+                                    style={inputStyle}
+                                />
+                            </div>
+
+                            <a
+                                href="https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks"
+                                target="_blank"
+                                rel="noopener noreferrer"
+                                style={helpLinkStyle}
+                            >
+                                How to get a Discord webhook URL
+                            </a>
+                        </div>
+
+                        {/* Slack */}
+                        <div style={sectionStyle}>
+                            <h3 style={{ marginTop: 0, marginBottom: "1rem" }}>
+                                Slack
+                            </h3>
+
+                            <div style={{ marginBottom: "0.5rem" }}>
+                                <label style={labelStyle}>
+                                    Slack Webhook URL
+                                </label>
+                                <input
+                                    type="text"
+                                    value={slackWebhookUrl}
+                                    onChange={(e) =>
+                                        setSlackWebhookUrl(e.target.value)
+                                    }
+                                    placeholder="https://hooks.slack.com/services/..."
+                                    style={inputStyle}
+                                />
+                            </div>
+
+                            <a
+                                href="https://api.slack.com/messaging/webhooks"
+                                target="_blank"
+                                rel="noopener noreferrer"
+                                style={helpLinkStyle}
+                            >
+                                How to set up Slack Incoming Webhooks
+                            </a>
+                        </div>
+
+                        {/* Save & Test buttons at the bottom */}
+                        <div
+                            style={{
+                                display: "flex",
+                                gap: "0.75rem",
+                                marginTop: "1rem",
+                            }}
+                        >
                            <button
                                onClick={handleSaveNotificationConfig}
                                disabled={notificationLoading}
@@ -564,67 +803,34 @@ export default function Alerts() {
                            </button>

                            <button
-                                onClick={handleTestWebhook}
-                                disabled={testingWebhook || !discordWebhookUrl}
+                                onClick={handleTestChannels}
+                                disabled={testingChannels}
                                style={{
                                    padding: "0.75rem 1.5rem",
                                    fontSize: "1rem",
-                                    backgroundColor:
-                                        testingWebhook || !discordWebhookUrl
-                                            ? "#333"
-                                            : "#28a745",
+                                    backgroundColor: testingChannels
+                                        ? "#333"
+                                        : "#28a745",
                                    color: "white",
                                    border: "none",
                                    borderRadius: "4px",
-                                    cursor:
-                                        testingWebhook || !discordWebhookUrl
-                                            ? "not-allowed"
-                                            : "pointer",
+                                    cursor: testingChannels
+                                        ? "not-allowed"
+                                        : "pointer",
                                }}
                            >
-                                {testingWebhook ? "Testing..." : "Test Webhook"}
+                                {testingChannels
+                                    ? "Testing..."
+                                    : "Test All Channels"}
                            </button>
                        </div>
                    </div>
-
-                    {/* Telegram Section (Coming Soon) */}
-                    <div style={{ marginBottom: "2rem", opacity: 0.5 }}>
-                        <h3 style={{ marginBottom: "1rem" }}>Telegram</h3>
-                        <div
-                            style={{
-                                padding: "1rem",
-                                backgroundColor: "#333",
-                                borderRadius: "4px",
-                                color: "#999",
-                                textAlign: "center",
-                            }}
-                        >
-                            Coming Soon
-                        </div>
-                    </div>
-
-                    {/* Email Section (Coming Soon) */}
-                    <div style={{ opacity: 0.5 }}>
-                        <h3 style={{ marginBottom: "1rem" }}>Email</h3>
-                        <div
-                            style={{
-                                padding: "1rem",
-                                backgroundColor: "#333",
-                                borderRadius: "4px",
-                                color: "#999",
-                                textAlign: "center",
-                            }}
-                        >
-                            Coming Soon
-                        </div>
-                    </div>
                </div>
            </div>
        </div>
    );
 }

-// Helper to format alert type for display
 function formatAlertType(type) {
    const labels = {
        incoming_tx: "Incoming transaction",
Author	SHA1	Message	Date
KS Jannette	7c36f3c214	readme change Some checks are pending check / check (push) Waiting to run Details	2026-03-01 07:55:00 -05:00
KS Jannette	37ff644aa7	audit: fix issues #1-#9 (mock data, notifier interface, retry/timeout, digest scheduling, real status, RPC retry, dedup, address edit UI) - #1: remove mock alert events that poisoned production responses - #2: add Notifier interface + Send implementations for all channels - #3/#4: notification goroutines now carry a 30s context timeout and retry up to 3x with exponential backoff - #5: schedule email digest in poller via DIGEST_INTERVAL_HOURS (default 24h) - #6: SystemStatus queries real checkpoint data; returns starting/active/idle with latestBlock and lag - #7: Ethereum RPC client retries on network errors, 429, and 5xx with 1s/2s backoff - #8: alert_events dedup index + ON CONFLICT DO NOTHING to prevent duplicate events on poller restart - #9: PATCH /v1/addresses/{id} for label editing; frontend address list gains inline edit and remove buttons	2026-03-01 07:49:08 -05:00
S Jannette	c80ed89c0a	Merge pull request #7 from kjannette/resend-sdk add sdk	2026-03-01 04:37:58 -05:00
KS Jannette	6590cbf4be	add sdk Some checks are pending check / check (push) Waiting to run Details	2026-03-01 04:31:32 -05:00
KS Jannette	61a8c5fe8b	hottie Some checks are pending check / check (push) Waiting to run Details	2026-03-01 03:54:06 -05:00
S Jannette	c79136a06e	Merge pull request #6 from kjannette/db-updates-to-keep-up-withe-alerts-functionality notifcation dongif setttings - save to DB	2026-03-01 03:37:04 -05:00
KS Jannette	a5590a438f	notifcation dongif setttings - save to DB Some checks are pending check / check (push) Waiting to run Details	2026-03-01 03:36:32 -05:00
S Jannette	1c196cae9f	Merge pull request #5 from kjannette/notifcations-logic-upgrade Building out notification update channels	2026-03-01 03:23:31 -05:00
KS Jannette	c494bf5f53	Building out notification update channels Some checks are pending check / check (push) Waiting to run Details	2026-03-01 03:23:08 -05:00
S Jannette	d07dc971fe	Merge pull request #4 from kjannette/style2 more style, mostly of w3 compliance	2026-03-01 02:06:25 -05:00
S Jannette	b1e63a24c7	Merge pull request #3 from kjannette/format-majorly Format majorly	2026-02-28 20:43:34 -05:00