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asyncpg returns JSONB columns as raw JSON strings when no type codec is configured (only pgvector is registered in _init_connection). The stored value is a correct JSONB array (jsonb_typeof=array confirmed), but asyncpg decodes it as str. Parse it explicitly in the GET handler so the frontend receives the correct Python list/dict. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>