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API.md

@@ -298,11 +298,11 @@ The store is exposed as a `LibDashStore` instance (see `src/index.js`). Each met
   - `listByCategoryId(googleAuthId: number, categoryId: number, tx?: object): Promise<Array<{id: number, categoryId: number, propertyId: number, name: string, exclusive: boolean, value: string, sort: number}>>`
   - `setByCategoryId(googleAuthId: number, categoryId: number, properties: Array<{propertyId: number, value: string, sort?: number}>, tx?: object): Promise<Array<{id: number, categoryId: number, propertyId: number, name: string, exclusive: boolean, value: string, sort: number}>>`
 - [modelconversation](API.modelconversation.md)
-  - `create(googleAuthId: number, input: {provider: string, model: string}, tx?: object): Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>`
+  - `create(googleAuthId: number, input: {provider: string, model: string, started_by?: number|null}, tx?: object): Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>`
   - `delete(googleAuthId: number, conversationId: number, tx?: object): Promise<void>`
-  - `get(googleAuthId: number, conversationId: number, tx?: object): Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>`
-  - `list(googleAuthId: number, tx?: object): Promise<Array<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>>`
-  - `setState(googleAuthId: number, conversationId: number, state: string, tx?: object): Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>`
+  - `get(googleAuthId: number, conversationId: number, tx?: object): Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>`
+  - `list(googleAuthId: number, tx?: object): Promise<Array<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null, first_user_message: string|null}>>`
+  - `setState(googleAuthId: number, conversationId: number, state: string, tx?: object): Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>`
 - [modelmessage](API.modelmessage.md)
   - `add(googleAuthId: number, conversationId: number, input: {message: string, role?: 'user'|'assistant'|'system'|'tool'|'reasoning'|'usage'}, tx?: object): Promise<{id: number, conversation_id: number, created_at: string, role: string, message: string}>`
   - `list(googleAuthId: number, conversationId: number, tx?: object): Promise<Array<{id: number, conversation_id: number, created_at: string, role: string, message: string}>>`

API.modelconversation.md

@@ -16,15 +16,16 @@ Creates a new (idle) model conversation for the user in the selected company.
 | `input` | `object` | Conversation input. |
 | `input.provider` | `string` | LLM provider name. |
 | `input.model` | `string` | Model identifier. |
+| `[input.started_by]` | `number|null` | Id of the conversation that starts this one as a subagent (unenforced reference; omit/null for a top-level conversation). |
 | `[tx]` | `object` | Optional transaction to run within. |
 
 **Returns**
 
-`Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>`
+`Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>`
 
 **Throws**
 
-`Error` — 'Provider required' or 'Model required'.
+`Error` — 'Provider required', 'Model required' or 'Invalid started_by'.
 
 **Example**
 
@@ -36,7 +37,7 @@ const c = await store.modelconversation.create(42, { provider: 'openrouter', mod
 
 *Source: `src/store/modelconversation/delete.js`*
 
-Deletes a model conversation by ID for the user in the selected company.
+Deletes a model conversation by ID for the user in the selected company, together with every subagent conversation below it (`started_by` chain, recursively) and their messages.
 
 **Parameters**
 
@@ -70,7 +71,7 @@ Gets a single model conversation by ID for the user in the selected company.
 
 **Returns**
 
-`Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>`
+`Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>`
 
 **Throws**
 
@@ -91,7 +92,7 @@ Lists the user's own model conversations in the selected company, newest activit
 
 **Returns**
 
-`Promise<Array<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>>`
+`Promise<Array<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null, first_user_message: string|null}>>` — `started_by` is the originating conversation id for subagent conversations (null otherwise), so clients can build a tree. `first_user_message` is the stored `message` payload of the conversation's first `user` message (null if none yet).
 
 **Example**
 
@@ -116,7 +117,7 @@ Sets the state of a model conversation ('idle' | 'busy').
 
 **Returns**
 
-`Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>`
+`Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>`
 
 **Throws**
 

scripts/test-modelconversation.js

@@ -33,6 +33,7 @@ async function run() {
 
     const list = await store.modelconversation.list(userA);
     assert.equal(list.length, 1);
+    assert.equal(list[0].first_user_message, null);
 
     assert.deepEqual(await store.modelmessage.list(userA, conv.id), []);
 
@@ -65,6 +66,7 @@ async function run() {
     const msgs = await store.modelmessage.list(userA, conv.id);
     assert.deepEqual(msgs.map((m) => m.message), ['hello', 'echo: hello', 'second']);
     assert.deepEqual(msgs.map((m) => m.role), ['user', 'assistant', 'user']);
+    assert.equal((await store.modelconversation.list(userA)).find((c) => c.id === conv.id).first_user_message, 'hello');
 
     // Other user cannot see or write
     const userB = await store.google_auth.add('mc-b@example.com');
@@ -74,6 +76,33 @@ async function run() {
     await assert.rejects(store.modelmessage.list(userB, conv.id), /Conversation not found/);
     await assert.rejects(store.modelmessage.add(userB, conv.id, { message: 'x' }), /Conversation not found/);
 
+    // started_by: top-level is null, subagents link to their originator, list exposes it
+    assert.equal(conv.started_by, null);
+    const sub1 = await store.modelconversation.create(userA, { provider: 'openrouter', model: 'm', started_by: conv.id });
+    assert.equal(sub1.started_by, conv.id);
+    const sub2 = await store.modelconversation.create(userA, { provider: 'openrouter', model: 'm', started_by: sub1.id });
+    const sibling = await store.modelconversation.create(userA, { provider: 'openrouter', model: 'm' });
+    await assert.rejects(
+      store.modelconversation.create(userA, { provider: 'openrouter', model: 'm', started_by: 0 }),
+      /Invalid started_by/,
+    );
+    const listed = await store.modelconversation.list(userA);
+    assert.equal(listed.find((c) => c.id === sub2.id).started_by, sub1.id);
+    assert.equal((await store.modelconversation.get(userA, sub1.id)).started_by, conv.id);
+    await store.modelmessage.add(userA, sub2.id, { message: 'deep' });
+
+    // Deleting a child removes only its own chain; deleting the root removes the whole chain
+    await store.modelconversation.delete(userA, sub2.id);
+    await assert.rejects(store.modelconversation.get(userA, sub2.id), /Conversation not found/);
+    await store.modelconversation.get(userA, sub1.id);
+    const sub3 = await store.modelconversation.create(userA, { provider: 'openrouter', model: 'm', started_by: sub1.id });
+    await store.modelconversation.delete(userA, conv.id);
+    for (const gone of [conv.id, sub1.id, sub3.id]) {
+      await assert.rejects(store.modelconversation.get(userA, gone), /Conversation not found/);
+    }
+    await store.modelconversation.get(userA, sibling.id);
+    await assert.rejects(store.modelconversation.delete(userA, conv.id), /Conversation not found/);
+
     console.log('PASS');
   } finally {
     await provider.close?.();

src/providers/mssql/queries/modelconversation.js

@@ -5,15 +5,25 @@ export const MODELCONVERSATION_COLUMNS = `
     model,
     created_at,
     updated_at,
-    state
+    state,
+    started_by
 `;
 
 export const LIST_BY_COMPANYUSER = `
 SELECT
-${MODELCONVERSATION_COLUMNS}
-FROM modelconversation
-WHERE companyuser_id = @companyuserId
-ORDER BY updated_at DESC, id DESC
+${MODELCONVERSATION_COLUMNS},
+    (
+        SELECT m.message
+        FROM modelmessage m
+        WHERE m.id = (
+            SELECT MIN(f.id)
+            FROM modelmessage f
+            WHERE f.conversation_id = c.id AND f.role = 'user'
+        )
+    ) AS first_user_message
+FROM modelconversation c
+WHERE c.companyuser_id = @companyuserId
+ORDER BY c.updated_at DESC, c.id DESC
 `;
 
 export const GET_BY_COMPANYUSER_AND_ID = `
@@ -27,7 +37,8 @@ export const CREATE = `
 INSERT INTO modelconversation (
     companyuser_id,
     provider,
-    model
+    model,
+    started_by
 )
 OUTPUT
     INSERTED.id,
@@ -36,11 +47,13 @@ OUTPUT
     INSERTED.model,
     INSERTED.created_at,
     INSERTED.updated_at,
-    INSERTED.state
+    INSERTED.state,
+    INSERTED.started_by
 VALUES (
     @companyuserId,
     @provider,
-    @model
+    @model,
+    @startedBy
 )
 `;
 
@@ -69,11 +82,30 @@ OUTPUT
     INSERTED.model,
     INSERTED.created_at,
     INSERTED.updated_at,
-    INSERTED.state
+    INSERTED.state,
+    INSERTED.started_by
 WHERE id = @id AND companyuser_id = @companyuserId
 `;
 
+/**
+ * Deletes a conversation and, because started_by is not a foreign key, the whole chain of
+ * subagent conversations below it (started_by -> id, recursively) in a single statement.
+ * Messages go with their conversations via ON DELETE CASCADE. rowsAffected is 0 only when
+ * the root conversation does not exist for this user (a root always yields >= 1 row).
+ */
 export const DELETE_BY_COMPANYUSER_AND_ID = `
+WITH subtree AS (
+    SELECT id
+    FROM modelconversation
+    WHERE id = @id AND companyuser_id = @companyuserId
+
+    UNION ALL
+
+    SELECT c.id
+    FROM modelconversation c
+    INNER JOIN subtree s ON c.started_by = s.id
+    WHERE c.companyuser_id = @companyuserId
+)
 DELETE FROM modelconversation
-WHERE id = @id AND companyuser_id = @companyuserId
+WHERE id IN (SELECT id FROM subtree)
 `;

src/providers/mssql/schema.js

@@ -819,10 +819,12 @@ BEGIN
         created_at DATETIME2 NOT NULL CONSTRAINT DF_modelconversation_created_at DEFAULT SYSUTCDATETIME(),
         updated_at DATETIME2 NOT NULL CONSTRAINT DF_modelconversation_updated_at DEFAULT SYSUTCDATETIME(),
         state NVARCHAR(20) NOT NULL CONSTRAINT DF_modelconversation_state DEFAULT 'idle',
+        started_by INT NULL, -- id of the conversation that started this one as a subagent; deliberately NOT a foreign key
         CONSTRAINT FK_modelconversation_companyuser FOREIGN KEY (companyuser_id) REFERENCES companyuser(id) ON DELETE CASCADE,
         CONSTRAINT CK_modelconversation_state CHECK (state IN ('idle', 'busy'))
     );
     CREATE INDEX IX_modelconversation_companyuser ON modelconversation (companyuser_id, updated_at);
+    CREATE INDEX IX_modelconversation_started_by ON modelconversation (started_by);
 END
 `;
 

src/providers/sqlite3/schema.js

@@ -511,9 +511,11 @@ CREATE TABLE IF NOT EXISTS modelconversation (
     created_at TEXT NOT NULL DEFAULT (${UTC_NOW}),
     updated_at TEXT NOT NULL DEFAULT (${UTC_NOW}),
     state TEXT NOT NULL DEFAULT 'idle' CHECK (state IN ('idle', 'busy')),
+    started_by INTEGER, -- id of the conversation that started this one as a subagent; deliberately NOT a foreign key
     FOREIGN KEY (companyuser_id) REFERENCES companyuser(id) ON DELETE CASCADE
 );
 CREATE INDEX IF NOT EXISTS IX_modelconversation_companyuser ON modelconversation (companyuser_id, updated_at);
+CREATE INDEX IF NOT EXISTS IX_modelconversation_started_by ON modelconversation (started_by);
 `;
 
 

src/store/modelconversation/create.js

@@ -15,9 +15,10 @@ export default function create(provider) {
    * @param {object} input - Conversation input.
    * @param {string} input.provider - LLM provider name.
    * @param {string} input.model - Model identifier.
+   * @param {number|null} [input.started_by] - Id of the conversation that starts this one as a subagent (unenforced reference; omit/null for a top-level conversation).
    * @param {object} [tx] - Optional transaction to run within.
-   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>}
-   * @throws {Error} 'Provider required' or 'Model required'.
+   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>}
+   * @throws {Error} 'Provider required', 'Model required' or 'Invalid started_by'.
    *
    * @example
    * const c = await store.modelconversation.create(42, { provider: 'openrouter', model: 'openai/gpt-5' });
@@ -28,6 +29,10 @@ export default function create(provider) {
     if (!providerName) throw new Error('Provider required');
     const model = typeof input.model === 'string' ? input.model.trim() : '';
     if (!model) throw new Error('Model required');
+    const startedBy = input.started_by ?? null;
+    if (startedBy !== null && (!Number.isInteger(startedBy) || startedBy <= 0)) {
+      throw new Error('Invalid started_by');
+    }
 
     const runner = makeRunner(provider, tx);
     const { companyuserId } = await access(googleAuthId, runner);
@@ -36,6 +41,7 @@ export default function create(provider) {
       companyuserId,
       provider: providerName,
       model,
+      startedBy,
     });
     return shape(result.rows[0]);
   };

src/store/modelconversation/delete.js

@@ -9,7 +9,8 @@ export default function del(provider) {
     provider?.dialect === 'sqlite3' ? SQLITE_DELETE : MSSQL_DELETE;
 
   /**
-   * Deletes a model conversation by ID for the user in the selected company.
+   * Deletes a model conversation by ID for the user in the selected company, together with
+   * every subagent conversation below it (`started_by` chain, recursively) and their messages.
    *
    * @param {number} googleAuthId - The id of the Google auth user.
    * @param {number} conversationId - The conversation id.

src/store/modelconversation/get.js

@@ -14,7 +14,7 @@ export default function get(provider) {
    * @param {number} googleAuthId - The id of the Google auth user.
    * @param {number} conversationId - The conversation id.
    * @param {object} [tx] - Optional transaction to run within.
-   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>}
+   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>}
    * @throws {Error} 'Conversation not found'.
    */
   return async (googleAuthId, conversationId, tx) => {

src/store/modelconversation/list.js

@@ -13,7 +13,7 @@ export default function list(provider) {
    *
    * @param {number} googleAuthId - The id of the Google auth user.
    * @param {object} [tx] - Optional transaction to run within.
-   * @returns {Promise<Array<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>>}
+   * @returns {Promise<Array<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null, first_user_message: string|null}>>} `started_by` is the originating conversation id for subagent conversations (null otherwise), so clients can build a tree. `first_user_message` is the stored `message` payload of the conversation's first `user` message (null if none yet).
    *
    * @example
    * const conversations = await store.modelconversation.list(42);
@@ -22,6 +22,9 @@ export default function list(provider) {
     const runner = makeRunner(provider, tx);
     const { companyuserId } = await access(googleAuthId, runner);
     const result = await runner.query(sql, { companyuserId });
-    return result.rows.map(shape);
+    return result.rows.map((row) => ({
+      ...shape(row),
+      first_user_message: row.first_user_message ?? null,
+    }));
   };
 }

src/store/modelconversation/setState.js

@@ -15,7 +15,7 @@ export default function setState(provider) {
    * @param {number} conversationId - The conversation id.
    * @param {string} state - The new state ('idle' | 'busy').
    * @param {object} [tx] - Optional transaction to run within.
-   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string}>}
+   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>}
    * @throws {Error} 'Invalid state' or 'Conversation not found'.
    */
   return async (googleAuthId, conversationId, state, tx) => {

src/store/modelconversation/shape.js

@@ -7,5 +7,6 @@ export default function shape(row) {
     created_at: row.created_at ?? row.createdAt,
     updated_at: row.updated_at ?? row.updatedAt,
     state: row.state,
+    started_by: row.started_by ?? row.startedBy ?? null,
   };
 }