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chore(db): remove workspace_agent_id from chats table (#22442)

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## Summary

Remove the `workspace_agent_id` column from the `chats` table and
dynamically look up the first workspace agent instead.

## Problem

When a workspace is stopped and restarted, the workspace agent gets a
new ID. The `workspace_agent_id` stored on the chat at creation time
becomes stale, making the agent unreachable. This caused chats to break
after workspace restarts.

## Solution

Instead of persisting the agent ID, dynamically look up the first agent
from the workspace's latest build via
`GetWorkspaceAgentsInLatestBuildByWorkspaceID` whenever an agent
connection is needed. The `workspace_id` on the chat remains stable
across restarts.

This behavior may be refined later (e.g., agent selection heuristics),
but picking the first agent resolves the immediate breakage.

## Changes

- **Migration 000425**: Drop `workspace_agent_id` column from `chats`
- **SQL queries**: Remove `workspace_agent_id` from `InsertChat` and
`UpdateChatWorkspace`
- **chatd.go**: `getWorkspaceConn` and `resolveInstructions` now look up
agents dynamically from workspace ID
- **chatd.go**: Remove `refreshChatWorkspaceSnapshot` (no longer needed)
- **createworkspace.go**: Stop persisting agent ID when associating
workspace with chat
- **subagent.go**: Stop passing agent ID to child chats
- **SDK/frontend**: Remove `WorkspaceAgentID` / `workspace_agent_id`
from Chat type

---------

Co-authored-by: Kyle Carberry <kylecarbs@gmail.com>
This commit is contained in:
Kyle Carberry
2026-02-28 16:46:51 -05:00
committed by GitHub
co-authored by Kyle Carberry
parent c316d0a3e7
commit 34d9392e37
18 changed files with 47 additions and 136 deletions
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codersdk/chats.go
-1
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@@ -32,7 +32,6 @@ type Chat struct {
ID uuid.UUID `json:"id" format:"uuid"`
OwnerID uuid.UUID `json:"owner_id" format:"uuid"`
WorkspaceID *uuid.UUID `json:"workspace_id,omitempty" format:"uuid"`
WorkspaceAgentID *uuid.UUID `json:"workspace_agent_id,omitempty" format:"uuid"`
ParentChatID *uuid.UUID `json:"parent_chat_id,omitempty" format:"uuid"`
RootChatID *uuid.UUID `json:"root_chat_id,omitempty" format:"uuid"`
LastModelConfigID uuid.UUID `json:"last_model_config_id" format:"uuid"`