fix: stop persisting empty assistant messages to the DB - #470
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughChat completion now uses an in-memory assistant placeholder during streaming. The assistant message is persisted only after a successful, non-whitespace response. Failed, aborted, incomplete, empty, or persistence-failed responses remove the placeholder. Message identity, citation persistence, and chat scrolling logic were also updated. ChangesChat message persistence
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: ⚪ Minimal · up to Assistant responses now remain temporary during streaming and are saved only after successful non-empty completion, preventing empty persisted messages. No current merge-blocking risk is identified. Sequence Diagram(s)sequenceDiagram
participant ChatUI
participant getCompletion
participant ChatStore
participant Supabase
ChatUI->>getCompletion: Start chat completion
getCompletion->>ChatStore: Create assistant placeholder
getCompletion->>ChatStore: Update placeholder during streaming
alt Successful non-whitespace response
getCompletion->>ChatStore: Persist pending message
ChatStore->>Supabase: Insert assistant message and citations
else Failed, aborted, incomplete, or empty response
getCompletion->>ChatStore: Remove pending message
end
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Inline comments:
In `@apps/frontend/src/store/use-chats-store.ts`:
- Around line 389-400: Update insertMessageIntoDb and its persistence flow to
write and return the web_citations, parla_citations, and open_data_citations
fields from the final NewChatMessage before persistPendingMessageToDb replaces
the optimistic message. Preserve these citation fields in the stored row and
resulting chat message.
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apps/frontend/src/api/chat/get-completion.tsapps/frontend/src/store/use-chats-store.tsapps/frontend/tests/e2e/chat-message-persistence.spec.ts
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
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Inline comments:
In `@apps/frontend/src/components/chat/hooks/use-chat-scrolling.tsx`:
- Around line 60-65: Update the scrolling effects in useChatScrolling so
chat-transition or initial-loading state, rather than userMessageCount alone,
determines whether a chat is newly created and should call
scrollNewMessageToTop(). Ensure existing one-message chats still run
scrollToBottom("auto"), and prevent ordinary appended-message count changes from
retriggering the delayed bottom-scroll effect or overriding the pin-to-top
state. Add E2E coverage for opening an existing one-message chat and switching
from a zero-message view to an existing one-message chat.
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apps/frontend/src/api/message/get-messages.tsapps/frontend/src/api/message/insert-message.tsapps/frontend/src/common.tsapps/frontend/src/components/chat/chat-messages.tsxapps/frontend/src/components/chat/hooks/use-chat-scrolling.tsxapps/frontend/src/store/use-chats-store.tsapps/frontend/tests/e2e/chat.spec.ts
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This feature had a side effect, which is why I needed to make some adjustments in the scrollig behaviour, adding also one test. Summary by Claude: While fixing the empty-assistant-message bug, deferring the assistant placeholder from an immediate DB write ( What broke: Fix: a chat's first message now explicitly uses the same "pin to top" path as any other new message, instead of racing that timer ( There's one known small gap: an existing chat with exactly one message could still be misclassified as "just created" (heuristic ambiguity). A proper fix needs an explicit signal from |
Assistant message rows were inserted into `chat_messages` immediately when the stream started, before any text arrived, then only patched via a debounced update on each delta. If a turn errored, was aborted, or ended without emitting any delta, the placeholder stayed empty forever (~2000 rows in production). A prior fix (#292) only filtered these out of the conversation history sent back to the LLM, it never stopped new empty rows from being written, since that insert happens in the frontend, a different code path than the one #292 touched. Now the placeholder lives in memory only (`createPendingMessageInMemory`) and is written to the DB in a single insert once the stream settles with real, non-whitespace content (`persistPendingMessageToDb`). Any other outcome, abort, error, or a stream that ends without [DONE], drops the placeholder instead (`removePendingMessageFromMemory`), so no DB row is ever created for a turn that never produced a real answer.
Keying the message list on `message.id` caused a full remount whenever an assistant message's id swapped from local to DB-assigned on persist. Added a stable `clientKey` field for the React key instead. That id-swap change also removed an incidental delay (an awaited DB insert) that a chat-switch scroll effect relied on to reliably jump to bottom before streamed content arrived. Without it, a new chat's first message raced a 1ms timer against the response — reproduced as a consistent webkit/Mobile Safari e2e failure. Fixed by having a chat's first message use the same "pin to top" behavior as any other new message, instead of racing that timer. Added e2e coverage for the untouched branch: opening an existing chat still scrolls to the bottom.
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raphael-arce
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lgtm 👍 should we also remove the filtering of empty messages in the backend then? e.g. this https://github.com/technologiestiftung/baergpt/blob/main/apps/backend/src/services/generation-service.ts#L332
2 participants
Assistant message rows were inserted into
chat_messagesimmediately when the stream started, before any text arrived, then only patched via a debounced update on each delta. If a turn errored, was aborted, or ended without emitting any delta, the placeholder stayed empty forever (~2000 rows in production). A prior fix (#292) only filtered these out of the conversation history sent back to the LLM, it never stopped new empty rows from being written, since that insert happens in the frontend, a different code path than the one #292 touched.Now the placeholder lives in memory only (
createPendingMessageInMemory) and is written to the DB in a single insert once the stream settles with real, non-whitespace content (persistPendingMessageToDb). Any other outcome, abort, error, or a stream that ends without [DONE], drops the placeholder instead (removePendingMessageFromMemory), so no DB row is ever created for a turn that never produced a real answer.Summary by CodeRabbit
New Features
Bug Fixes
Tests