informatics-isi-edu / deriva-mcp-ui / 23876778226

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 Fix PostgreSQL backend: remove invalid prepared statement caching

  asyncpg Connection objects do not support arbitrary attribute assignment,
  so the _init_conn approach of storing PreparedStatement objects as conn
  attributes raised AttributeError at runtime.  Removed the manual caching
  pattern entirely -- asyncpg has a built-in per-connection LRU statement
  cache that prepares and reuses query plans automatically.  _init_conn now
  only runs the idempotent DDL; all methods call fetchrow/execute directly.

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