-- Add custom_env column to agent table for user-configurable environment
-- variables that get injected into the agent subprocess at launch time.
-- Supports router/proxy (ANTHROPIC_API_KEY, ANTHROPIC_BASE_URL),
-- Bedrock (CLAUDE_CODE_USE_BEDROCK + AWS creds), and Vertex AI modes.
ALTER TABLE agent ADD COLUMN custom_env JSONB NOT NULL DEFAULT '{}';