Add initial project structure with Docker setup and frontend/backend files

db/init.sql

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+-- Create Users table
+CREATE TABLE IF NOT EXISTS users (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    email VARCHAR(120) UNIQUE NOT NULL,
+    age INTEGER NOT NULL,
+    location VARCHAR(100) NOT NULL,
+    gender VARCHAR(10) NOT NULL,
+    password_hash VARCHAR(128) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Create Messages table
+CREATE TABLE IF NOT EXISTS messages (
+    id SERIAL PRIMARY KEY,
+    sender_id INTEGER NOT NULL REFERENCES users(id),
+    receiver_id INTEGER NOT NULL REFERENCES users(id),
+    content VARCHAR(500) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Create index for faster queries on location
+CREATE INDEX IF NOT EXISTS idx_users_location ON users(location);
+
+-- Create indexes for faster message retrieval
+CREATE INDEX IF NOT EXISTS idx_messages_sender ON messages(sender_id);
+CREATE INDEX IF NOT EXISTS idx_messages_receiver ON messages(receiver_id);
+
+-- Function to update the updated_at column
+CREATE OR REPLACE FUNCTION update_updated_at_column()
+RETURNS TRIGGER AS $$
+BEGIN
+   NEW.updated_at = CURRENT_TIMESTAMP;
+   RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+-- Drop the trigger if it already exists to avoid conflicts
+DROP TRIGGER IF EXISTS update_users_updated_at ON users;
+
+-- Create trigger to automatically update the updated_at column
+CREATE TRIGGER update_users_updated_at
+    BEFORE UPDATE ON users
+    FOR EACH ROW
+    EXECUTE FUNCTION update_updated_at_column();
+
+-- Grant necessary permissions to workout_user
+GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO workout_user;
+GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO workout_user;