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Contract Delta: 004-postgres-database-replacement

Parent state: 003-containerized-compose-runtime

OpenAPI Changes​

  • No REST OpenAPI contract changes.

Event Contract Changes​

  • No trade-feed Socket.IO event contract changes in this state.

Compatibility Notes​

  • UI-visible behavior and endpoint contracts are intentionally preserved.
  • Persistence backend contract changes are internal (SQL engine + init process) and do not change REST payload shapes.
  • Account sequence semantics are preserved using PostgreSQL accounts_seq.