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Kyle Carberry
483adc59fe
Replaces the singular `InsertChatMessage` query with `InsertChatMessages` that uses PostgreSQL's `unnest()` for batch inserts. This reduces the number of database round-trips when inserting multiple messages in a single transaction. ## Changes - **SQL**: New `InsertChatMessages :many` query using `unnest()` arrays following the existing codebase pattern (e.g., `InsertWorkspaceAgentStats`). Preserves the CTE that updates `chats.last_model_config_id` using the last non-null model config from the batch. Uses `NULLIF` for UUID columns to handle NULL foreign keys. - **Go layers**: Updated `querier.go`, `dbauthz.go`, `dbmetrics/querymetrics.go`, `dbmock/dbmock.go`, and `queries.sql.go` to use the new batch signature (`[]ChatMessage` return type, array params). - **chatd.go**: All call sites converted to batch inserts: - **CreateChat**: System prompt + user message batched into one call - **persistStep**: Assistant message + tool messages batched into one call - **persistSummary**: Hidden summary + assistant + tool messages batched into one call - Single-message sites use the same API with single-element arrays - **Helper**: New `appendChatMessage` function simplifies building batch params at each call site. - **Tests**: All test files updated to use the new API. Builds on top of #23213.