first commit of refactor

backend/models/AlertEventModel.js

@@ -0,0 +1,56 @@
+import pool from '../infra/database.js';
+
+/**
+ * List recent alert events for a specific user
+ * @param {string} user_id - Firebase user ID
+ * @param {number} limit - Maximum number of events to return
+ * @returns {Promise<Array>} Array of alert event objects
+ */
+export async function listRecentByUser(user_id, limit = 20) {
+  const result = await pool.query(
+    `SELECT ae.id, ae.alert_rule_id, ae.message, ae.address_label, ae.tx_hash, ae.timestamp
+     FROM alert_events ae
+     JOIN alert_rules ar ON ar.id = ae.alert_rule_id
+     JOIN addresses a ON a.id = ar.address_id
+     WHERE a.user_id = $1
+     ORDER BY ae.timestamp DESC
+     LIMIT $2`,
+    [user_id, limit]
+  );
+  return result.rows;
+}
+
+/**
+ * List recent alert events
+ * @param {number} limit - Maximum number of event
+ * @returns {Promise<Array>} Array of alert event objects
+ */
+export async function listRecent(limit = 20) {
+  const result = await pool.query(
+    `SELECT id, alert_rule_id, message, address_label, tx_hash, timestamp
+     FROM alert_events
+     ORDER BY timestamp DESC
+     LIMIT $1`,
+    [limit]
+  );
+  return result.rows;
+}
+
+/**
+ * Create a new alert event
+ * @param {number} alertRuleId - Alert rule ID
+ * @param {string} message - Alert message
+ * @param {string|null} addressLabel - Address label (denormalized)
+ * @param {string|null} txHash - Transaction hash (optional, null for non-tx alerts)
+ * @returns {Promise<Object>} Created alert event object
+ */
+export async function create(alertRuleId, message, addressLabel, txHash = null) {
+  const result = await pool.query(
+    `INSERT INTO alert_events (alert_rule_id, message, address_label, tx_hash)
+     VALUES ($1, $2, $3, $4)
+     RETURNING id, alert_rule_id, message, address_label, tx_hash, timestamp`,
+    [alertRuleId, message, addressLabel, txHash]
+  );
+  return result.rows[0];
+}
+