-- Migration: Create activity_logs table - uses UUID v7
-- Description: Stores activity logs for auditing and monitoring

CREATE TABLE IF NOT EXISTS activity_logs (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v7(),
    user_id UUID REFERENCES users(id) ON DELETE SET NULL,
    tenant_id UUID,
    
    -- Activity Info
    action VARCHAR(100) NOT NULL,
    resource_type VARCHAR(50),
    resource_id VARCHAR(50),
    
    -- Details
    description TEXT,
    metadata JSONB,
    ip_address VARCHAR(45),
    user_agent TEXT,
    
    -- Metadata
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Indexes for efficient querying
CREATE INDEX IF NOT EXISTS idx_activity_logs_user ON activity_logs(user_id);
CREATE INDEX IF NOT EXISTS idx_activity_logs_tenant ON activity_logs(tenant_id);
CREATE INDEX IF NOT EXISTS idx_activity_logs_action ON activity_logs(action);
CREATE INDEX IF NOT EXISTS idx_activity_logs_resource ON activity_logs(resource_type, resource_id);
CREATE INDEX IF NOT EXISTS idx_activity_logs_created ON activity_logs(created_at DESC);

COMMENT ON TABLE activity_logs IS 'Audit log of all system activities';