-- Create sessions table
CREATE TABLE IF NOT EXISTS sessions (
    id UUID PRIMARY KEY,
    user_id UUID NOT NULL,
    token_hash VARCHAR(64) NOT NULL UNIQUE,
    ip_address VARCHAR(45),
    user_agent TEXT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
    revoked_at TIMESTAMP WITH TIME ZONE,
    
    CONSTRAINT fk_sessions_users FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);

-- Index for faster lookups/cleanup
CREATE INDEX IF NOT EXISTS idx_sessions_user_id ON sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_sessions_expires_at ON sessions(expires_at);
CREATE INDEX IF NOT EXISTS idx_sessions_revoked_at ON sessions(revoked_at);