Scaffold custom reports app (LXC 122 · /reports)

Framework for categorised custom reports pulling from NewBook, ResOS,
SambaPOS, and internal data. Report tree with collapsible categories
and subcategories; date-range params; run-audit log in reports_db.

Initial reports: NewBook arrivals/departures/stayovers/bookings-by-source,
ResOS covers/revenue, SambaPOS sales-summary/top-products, internal run-history.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/db.js

@@ -0,0 +1,23 @@
+import pg from 'pg'
+
+const { Pool } = pg
+export const pool = new Pool({ connectionString: process.env.DATABASE_URL })
+
+export async function initDb() {
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS report_runs (
+      id          SERIAL PRIMARY KEY,
+      report_id   TEXT NOT NULL,
+      report_name TEXT NOT NULL,
+      user_email  TEXT NOT NULL,
+      date_from   DATE,
+      date_to     DATE,
+      row_count   INTEGER,
+      duration_ms INTEGER,
+      error       TEXT,
+      ran_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
+    );
+    CREATE INDEX IF NOT EXISTS report_runs_ran_at_idx  ON report_runs (ran_at DESC);
+    CREATE INDEX IF NOT EXISTS report_runs_report_id_idx ON report_runs (report_id);
+  `)
+}