feat: add ESLint and Prettier configuration for code quality

- Added ESLint with TypeScript support and custom rules.
- Introduced Prettier for consistent code formatting.
- Updated package.json to include lint and format scripts.
- Modified db.ts to ensure proper parsing of BIGINT types from PostgreSQL.
- Enhanced webRoutes to coerce timestamp fields to numbers and format isDeleted as boolean.

CollabTableServer/src/db.ts

@@ -1,6 +1,6 @@
 import dotenv from 'dotenv';
 import BetterSqlite3, { Database as SqliteDB } from 'better-sqlite3';
-import { Pool, PoolClient, QueryResult } from 'pg';
+import { Pool, PoolClient, QueryResult, types as pgTypes } from 'pg';
 import path from 'path';
 import fs from 'fs';
 
@@ -129,6 +129,9 @@ class PostgresAdapter implements DBAdapter {
   private pool: Pool;
 
   constructor() {
+    // Ensure BIGINT (int8) is parsed as number to avoid string timestamps
+    // OID 20 = INT8, OID 1700 = NUMERIC (keep default for now)
+    pgTypes.setTypeParser(20, (val: string) => parseInt(val, 10));
     const connectionString = process.env.DATABASE_URL;
     if (connectionString) {
       this.pool = new Pool({ connectionString });

CollabTableServer/src/routes/webRoutes.ts

@@ -313,9 +313,26 @@ router.get('/web/data', async (req: Request, res: Response) => {
     const values = await dbAdapter.queryAll('SELECT * FROM item_values');
     
     // Convert isDeleted from INTEGER to BOOLEAN
-    const formattedLists = (lists as any[]).map(list => ({ ...list, isDeleted: !!list.isDeleted }));
-    const formattedFields = (fields as any[]).map(field => ({ ...field, isDeleted: !!field.isDeleted }));
-    const formattedItems = (items as any[]).map(item => ({ ...item, isDeleted: !!item.isDeleted }));
+        // Coerce timestamps to numbers (pg may return strings)
+        const toNum = (v: any) => (typeof v === 'string' ? Number(v) : v);
+        const formattedLists = (lists as any[]).map(list => ({
+            ...list,
+            isDeleted: !!list.isDeleted,
+            createdAt: toNum(list.createdAt),
+            updatedAt: toNum(list.updatedAt)
+        }));
+        const formattedFields = (fields as any[]).map(field => ({
+            ...field,
+            isDeleted: !!field.isDeleted,
+            createdAt: toNum(field.createdAt),
+            updatedAt: toNum(field.updatedAt)
+        }));
+        const formattedItems = (items as any[]).map(item => ({
+            ...item,
+            isDeleted: !!item.isDeleted,
+            createdAt: toNum(item.createdAt),
+            updatedAt: toNum(item.updatedAt)
+        }));
     
     res.json({
       lists: formattedLists,