feat: DB-Schema (candles, backtest_runs), Migration, CandleStore

src/server/db/schema.ts

@@ -0,0 +1,23 @@
+import { doublePrecision, jsonb, pgTable, primaryKey, serial, text, timestamp, varchar } from 'drizzle-orm/pg-core';
+
+export const candles = pgTable(
+  'candles',
+  {
+    pair: varchar('pair', { length: 16 }).notNull(),
+    ts: timestamp('ts', { withTimezone: true }).notNull(),
+    open: doublePrecision('open').notNull(),
+    high: doublePrecision('high').notNull(),
+    low: doublePrecision('low').notNull(),
+    close: doublePrecision('close').notNull(),
+    volume: doublePrecision('volume').notNull(),
+  },
+  (t) => [primaryKey({ columns: [t.pair, t.ts] })],
+);
+
+export const backtestRuns = pgTable('backtest_runs', {
+  id: serial('id').primaryKey(),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+  kind: text('kind').notNull(), // 'single' | 'walkforward'
+  config: jsonb('config').notNull(),
+  result: jsonb('result').notNull(),
+});