Scope workspace tasks to the bot that has them

A workspace's task now carries the bot that has it there (bot_id with
workspace_id), or none while it's shared. A bot reaches its own list and,
in its workspaces, its own tasks plus the shared ones; a workspace admin
every task there. Bots create workspace tasks for themselves by default,
take a shared one by starting it, and hand-overs record the new bot.
Removing or deleting a bot makes its workspace tasks shared again. The
conversation's Tasks modal shows that bot's tasks in the workspace.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/functions/backend/db/tasks/grab-tasks.ts

@@ -24,10 +24,21 @@ type Params = {
      */
     admin_workspace_ids?: number[];
     /**
-     * Only one collection.
+     * Only the tasks this bot has (anywhere, unless narrowed).
      */
     only_bot_id?: number | string | null;
+    /**
+     * With `only_bot_id`: also the shared ones nobody has yet.
+     */
+    with_unassigned?: boolean;
+    /**
+     * Only one workspace's tasks.
+     */
     only_workspace_id?: number | string | null;
+    /**
+     * Only bots' own lists, outside any workspace.
+     */
+    own_list?: boolean;
     /**
      * Only these statuses; none for every one.
      */
@@ -50,7 +61,9 @@ export default async function grabTasks({
     is_coordinator,
     admin_workspace_ids,
     only_bot_id,
+    with_unassigned,
     only_workspace_id,
+    own_list,
     statuses,
     open_only,
     limit,
@@ -69,10 +82,14 @@ export default async function grabTasks({
     }
 
     if (only_bot_id) {
-        where.push(`t.bot_id = ?`);
+        where.push(with_unassigned ? `(t.bot_id = ? OR t.bot_id IS NULL)` : `t.bot_id = ?`);
         values.push(Number(only_bot_id));
     }
 
+    if (own_list) {
+        where.push(`t.workspace_id IS NULL`);
+    }
+
     if (only_workspace_id) {
         where.push(`t.workspace_id = ?`);
         values.push(Number(only_workspace_id));