first commit of restructured project

trahn-trade-backend/db/schema.sql

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+-- Trahn Grid Trader Database Schema
+-- PostgreSQL
+
+-- Table 1: Price History
+-- Stores ETH price data points from CoinGecko
+CREATE TABLE IF NOT EXISTS price_history (
+    id BIGSERIAL PRIMARY KEY,
+    timestamp TIMESTAMPTZ NOT NULL,
+    price DECIMAL(12, 2) NOT NULL,
+    trading_day DATE NOT NULL,
+    source VARCHAR(50) DEFAULT 'coingecko',
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_price_timestamp ON price_history(timestamp);
+CREATE INDEX IF NOT EXISTS idx_price_trading_day ON price_history(trading_day);
+
+-- Table 2: Trade History
+-- Stores executed trades (buys and sells)
+CREATE TABLE IF NOT EXISTS trade_history (
+    id BIGSERIAL PRIMARY KEY,
+    timestamp TIMESTAMPTZ NOT NULL,
+    trading_day DATE NOT NULL,
+    side VARCHAR(10) NOT NULL CHECK (side IN ('buy', 'sell')),
+    price DECIMAL(12, 2) NOT NULL,
+    quantity DECIMAL(18, 8) NOT NULL,
+    usd_value DECIMAL(12, 2) NOT NULL,
+    grid_level INTEGER,
+    tx_hash VARCHAR(66),
+    is_paper_trade BOOLEAN DEFAULT FALSE,
+    slippage_percent DECIMAL(5, 3),
+    gas_cost_eth DECIMAL(18, 8),
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_trade_timestamp ON trade_history(timestamp);
+CREATE INDEX IF NOT EXISTS idx_trade_trading_day ON trade_history(trading_day);
+CREATE INDEX IF NOT EXISTS idx_trade_side ON trade_history(side);
+
+-- Table 3: Support/Resistance History
+-- Stores S/R levels fetched from Dune Analytics over time
+CREATE TABLE IF NOT EXISTS support_resistance_history (
+    id BIGSERIAL PRIMARY KEY,
+    timestamp TIMESTAMPTZ NOT NULL,
+    method VARCHAR(20) NOT NULL,
+    lookback_days INTEGER NOT NULL,
+    support DECIMAL(12, 2) NOT NULL,
+    resistance DECIMAL(12, 2) NOT NULL,
+    midpoint DECIMAL(12, 2) NOT NULL,
+    avg_price DECIMAL(12, 2),
+    grid_recalculated BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_sr_timestamp ON support_resistance_history(timestamp);
+
+-- Table 4: Grid State
+-- Stores current grid configuration and state
+-- Only one active row at a time (or keyed by bot instance)
+CREATE TABLE IF NOT EXISTS grid_state (
+    id SERIAL PRIMARY KEY,
+    base_price DECIMAL(12, 2),
+    grid_levels_json JSONB,
+    trades_executed INTEGER DEFAULT 0,
+    total_profit DECIMAL(12, 2) DEFAULT 0,
+    last_sr_refresh TIMESTAMPTZ,
+    is_active BOOLEAN DEFAULT TRUE,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_grid_active ON grid_state(is_active);
+
+-- View: Latest S/R
+-- Convenience view for getting the most recent S/R data
+CREATE OR REPLACE VIEW latest_support_resistance AS
+SELECT * FROM support_resistance_history
+ORDER BY timestamp DESC
+LIMIT 1;
+