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Shared types and utilities for both frontend and backend\n\n// User types (without sensitive data)\nexport interface UserInfo {\n id: number;\n email: string;\n name: string;\n}\n\n// Location types\nexport interface LocationInfo {\n id: number;\n name: string;\n latitude: number;\n longitude: number;\n created_at: string;\n}\n\n// Alert types\nexport interface AlertInfo {\n id: number;\n location_id: number;\n location_name: string;\n alert_date: string;\n message: string;\n created_at: string;\n}\n\n// Auth types\nexport interface SignupRequest {\n email: string;\n password: string;\n name: string;\n}\n\nexport interface LoginRequest {\n email: string;\n password: string;\n}\n\nexport interface AuthResponse {\n user: UserInfo;\n token: string;\n}\n\n// Location types\nexport interface AddLocationRequest {\n name: string;\n latitude: number;\n longitude: number;\n}\n\n// Osun State boundaries (approximate)\nexport const OSUN_STATE_BOUNDS = {\n north: 8.1, // Northern latitude boundary\n south: 7.0, // Southern latitude boundary\n east: 5.1, // Eastern longitude boundary\n west: 4.0 // Western longitude boundary\n};\n\n// Check if coordinates are within Osun State\nexport function isInOsunState(latitude: number, longitude: number): boolean {\n return (\n latitude >= OSUN_STATE_BOUNDS.south &&\n latitude <= OSUN_STATE_BOUNDS.north &&\n longitude >= OSUN_STATE_BOUNDS.west &&\n longitude <= OSUN_STATE_BOUNDS.east\n );\n}\n\n// Format date for display\nexport function formatDate(dateString: string): string {\n const date = new Date(dateString);\n return date.toLocaleDateString('en-NG', {\n weekday: 'long',\n year: 'numeric',\n month: 'long',\n day: 'numeric'\n 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Osun State Flood Alert System\n\nA web application that allows residents of Osun State, Nigeria to receive early flood warnings based on weather forecasts.\n\n## Features\n\n- User authentication (signup and login)\n- Location management for Osun State areas\n- Flood prediction system (2 weeks in advance)\n- Email notifications for flood alerts\n\n## Project Structure\n\n- `/backend` - Server-side code and API endpoints\n- `/frontend` - User interface and client-side code\n- `/shared` - Shared types and utilities\n\n## Technologies\n\n- Backend: Hono (TypeScript)\n- Database: SQLite\n- Frontend: HTML, JavaScript, Tailwind CSS\n- Weather Data: Open-Meteo API\n- Notifications: Email\n\n## How It Works\n\n1. Users sign up with their email and basic details\n2. After login, users can add their location within Osun State\n3. The system checks weather forecasts daily for potential flooding\n4. 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RETURNING id`,\n [email, passwordHash, name]\n );\n return result.rows[0].id;\n}\n\nexport async function getUserByEmail(email: string): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${USERS_TABLE} WHERE email = ?`,\n [email]\n );\n return result.rows[0] || null;\n}\n\nexport async function getUserById(id: number): Promise {\n const result = await sqlite.execute(\n `SELECT id, email, name, created_at FROM ${USERS_TABLE} WHERE id = ?`,\n [id]\n );\n return result.rows[0] || null;\n}\n\n// Location queries\nexport async function createLocation(userId: number, name: string, latitude: number, longitude: number): Promise {\n const result = await sqlite.execute(\n `INSERT INTO ${LOCATIONS_TABLE} (user_id, name, latitude, longitude) VALUES (?, ?, ?, ?) RETURNING id`,\n [userId, name, latitude, longitude]\n );\n return result.rows[0].id;\n}\n\nexport async function getLocationsByUserId(userId: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${LOCATIONS_TABLE} WHERE user_id = ?`,\n [userId]\n );\n return result.rows;\n}\n\nexport async function getLocationById(id: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${LOCATIONS_TABLE} WHERE id = ?`,\n [id]\n );\n return result.rows[0] || null;\n}\n\nexport async function deleteLocation(id: number, userId: number): Promise {\n const result = await sqlite.execute(\n `DELETE FROM ${LOCATIONS_TABLE} WHERE id = ? AND user_id = ?`,\n [id, userId]\n );\n return result.rowsAffected > 0;\n}\n\n// Alert queries\nexport async function createAlert(userId: number, locationId: number, alertDate: string, message: string): Promise {\n const result = await sqlite.execute(\n `INSERT INTO ${ALERTS_TABLE} (user_id, location_id, alert_date, message) VALUES (?, ?, ?, ?) RETURNING id`,\n [userId, locationId, alertDate, message]\n );\n return result.rows[0].id;\n}\n\nexport async function getAlertsByUserId(userId: number): Promise {\n const result = await sqlite.execute(\n `SELECT * FROM ${ALERTS_TABLE} WHERE user_id = ? 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Diff · v4