feat: add user preferences for task reminders

src/database/schema.sql

@@ -25,6 +25,13 @@ CREATE TABLE IF NOT EXISTS users (
   last_seen TEXT -- ISO 8601 timestamp of last activity
 );
 
+-- User preferences table
+CREATE TABLE IF NOT EXISTS user_preferences (
+  phone_number TEXT PRIMARY KEY,
+  reminders_enabled BOOLEAN NOT NULL DEFAULT TRUE,
+  FOREIGN KEY(phone_number) REFERENCES users(phone_number)
+);
+
 -- Create triggers for task timestamps
 CREATE TRIGGER IF NOT EXISTS update_task_timestamp
 AFTER UPDATE ON tasks

src/services/userService.ts

@@ -0,0 +1,18 @@
+import { query, execute } from '../database/db';
+
+export function getUserPreferences(phoneNumber: string) {
+  return query(
+    'SELECT * FROM user_preferences WHERE phone_number = ?',
+    [phoneNumber]
+  )[0] || { phone_number: phoneNumber, reminders_enabled: true };
+}
+
+export function setRemindersEnabled(phoneNumber: string, enabled: boolean) {
+  execute(
+    `INSERT INTO user_preferences (phone_number, reminders_enabled)
+     VALUES (?, ?)
+     ON CONFLICT(phone_number) DO UPDATE SET
+       reminders_enabled = excluded.reminders_enabled`,
+    [phoneNumber, enabled]
+  );
+}