Read-only and read-write database access for agents over MCP.
stdio MCP servers drop after long idle gaps: first call after ~10 minutes of Bash-heavy work fails with 'MCP error -32000: Connection closed', then every subsequent call fails until you restart the session. Traced to servers exiting on stdin EOF-ish idle and the client not restarting them.
Never let an agent's migration touch a database you care about on the first run. A disposable shadow database catches destructive DDL, broken backfills, and the classic 'rename via drop-and-create' before they reach even your dev data.
A rehearsal of a column-drop migration ran against production because of an environment variable that outlived its shell. Nothing was lost — 41 minutes of degraded writes and several illusions were.