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feat: add chat read/unread indicator to sidebar (#23129)

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## Summary

Adds read/unread tracking for chats so users can see which agent
conversations have new assistant messages they haven't viewed.

## Backend Changes

- Adds `last_read_message_id` column to the `chats` table (migration
000439).
- Computes `has_unread` as a virtual column in `GetChatsByOwnerID` using
an `EXISTS` subquery checking for assistant messages beyond the read
cursor.
- Exposes `has_unread` on the `codersdk.Chat` struct and auto-generated
TypeScript types.
- Updates `last_read_message_id` on stream connect/disconnect in
`streamChat`, avoiding per-message API calls during active streaming.
- Uses `context.WithoutCancel` for the deferred disconnect write so the
DB update succeeds even after the client disconnects.

## Frontend Changes

- Bold title (`font-semibold`) for unread chats in the sidebar.
- Small blue dot indicator next to the relative timestamp.
- Suppresses unread indicator for the currently active chat via
`isActive` from NavLink.

## Design Decisions

- Only `assistant` messages count as unread — the user's own messages
don't trigger the indicator.
- No foreign key on `last_read_message_id` since messages can be deleted
(via rollback/truncation) and the column is just a high-water mark.
- Zero API calls during streaming: exactly 2 DB writes per stream
session (connect + disconnect).
- Unread state refreshes on chat list load and window focus. The
`watchChats` WebSocket optimistically marks non-active chats as unread
on `status_change` events, but does not carry a server-computed
`has_unread` field. Navigating to a chat optimistically clears its
unread indicator in the cache.
This commit is contained in:
Kyle Carberry
2026-03-27 12:15:04 -04:00
committed by GitHub
parent a5c72ba396
commit bcdc35ee3e
32 changed files with 547 additions and 123 deletions
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coderd/database/querier.go
+4 -1
View File
@@ -275,7 +275,7 @@ type sqlcQuerier interface {
// Returns the global TTL for chat workspaces as a Go duration string.
// Returns "0s" (disabled) when no value has been configured.
GetChatWorkspaceTTL(ctx context.Context) (string, error)
GetChats(ctx context.Context, arg GetChatsParams) ([]Chat, error)
GetChats(ctx context.Context, arg GetChatsParams) ([]GetChatsRow, error)
GetChatsByWorkspaceIDs(ctx context.Context, ids []uuid.UUID) ([]Chat, error)
GetConnectionLogsOffset(ctx context.Context, arg GetConnectionLogsOffsetParams) ([]GetConnectionLogsOffsetRow, error)
GetCryptoKeyByFeatureAndSequence(ctx context.Context, arg GetCryptoKeyByFeatureAndSequenceParams) (CryptoKey, error)
@@ -854,6 +854,9 @@ type sqlcQuerier interface {
UpdateChatHeartbeat(ctx context.Context, arg UpdateChatHeartbeatParams) (int64, error)
UpdateChatLabelsByID(ctx context.Context, arg UpdateChatLabelsByIDParams) (Chat, error)
UpdateChatLastModelConfigByID(ctx context.Context, arg UpdateChatLastModelConfigByIDParams) (Chat, error)
// Updates the last read message ID for a chat. This is used to track
// which messages the owner has seen, enabling unread indicators.
UpdateChatLastReadMessageID(ctx context.Context, arg UpdateChatLastReadMessageIDParams) error
UpdateChatMCPServerIDs(ctx context.Context, arg UpdateChatMCPServerIDsParams) (Chat, error)
UpdateChatMessageByID(ctx context.Context, arg UpdateChatMessageByIDParams) (ChatMessage, error)
UpdateChatModelConfig(ctx context.Context, arg UpdateChatModelConfigParams) (ChatModelConfig, error)