Add PostgreSQL support with SQLite/Postgres database compatibility layer

- Add dbGet/dbAll helper functions for database-agnostic queries
- Add toDbBool/convertBooleansForDb for boolean type conversion
- Add toDbDate/getNow for timestamp type handling
- Add generateId that returns UUID for Postgres, nanoid for SQLite
- Update all routes to use compatibility helpers
- Add normalizeEvent to return clean number types from Postgres decimal
- Add formatPrice utility for consistent price display
- Add legal pages admin interface with RichTextEditor
- Update carousel images
- Add drizzle migration files for PostgreSQL

backend/src/db/index.ts

@@ -1,3 +1,4 @@
+import 'dotenv/config';
 import { drizzle as drizzleSqlite } from 'drizzle-orm/better-sqlite3';
 import { drizzle as drizzlePg } from 'drizzle-orm/node-postgres';
 import Database from 'better-sqlite3';
@@ -29,5 +30,51 @@ if (dbType === 'postgres') {
   db = drizzleSqlite(sqlite, { schema });
 }
 
-export { db };
+// ==================== Database Compatibility Helpers ====================
+// These functions abstract the differences between SQLite and PostgreSQL Drizzle drivers:
+// - SQLite uses .get() for single result, .all() for multiple
+// - PostgreSQL returns arrays directly (no .get()/.all() methods)
+
+/**
+ * Get a single result from a query (works with both SQLite and PostgreSQL)
+ * @param query - A Drizzle query builder (e.g., db.select().from(table).where(...))
+ * @returns The first result or null
+ */
+export async function dbGet<T>(query: any): Promise<T | null> {
+  if (dbType === 'postgres') {
+    const results = await query;
+    return results[0] || null;
+  }
+  // SQLite - use .get()
+  return query.get() || null;
+}
+
+/**
+ * Get all results from a query (works with both SQLite and PostgreSQL)
+ * @param query - A Drizzle query builder (e.g., db.select().from(table).where(...))
+ * @returns Array of results
+ */
+export async function dbAll<T>(query: any): Promise<T[]> {
+  if (dbType === 'postgres') {
+    return await query;
+  }
+  // SQLite - use .all()
+  return query.all();
+}
+
+/**
+ * Check if using PostgreSQL
+ */
+export function isPostgres(): boolean {
+  return dbType === 'postgres';
+}
+
+/**
+ * Check if using SQLite
+ */
+export function isSqlite(): boolean {
+  return dbType === 'sqlite';
+}
+
+export { db, dbType };
 export * from './schema.js';