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backend/migrations/028_add_usage_logs_user_agent.sql

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+-- Add user_agent column to usage_logs table
+-- Records the User-Agent header from API requests for analytics and debugging
+
+ALTER TABLE usage_logs
+    ADD COLUMN IF NOT EXISTS user_agent VARCHAR(512);
+
+-- Optional: Add index for user_agent queries (uncomment if needed for analytics)
+-- CREATE INDEX IF NOT EXISTS idx_usage_logs_user_agent ON usage_logs(user_agent);
+
+COMMENT ON COLUMN usage_logs.user_agent IS 'User-Agent header from the API request';