feat: persistent AI memory — chat history + knowledge store

agent-chat/route.ts:
- Loads conversation history from chat_conversations before each turn
- Passes history + knowledge context to agent runner
- Saves returned history back to chat_conversations after each turn
- Saves AI-generated memory updates to fs_knowledge_items

knowledge/route.ts (new):
- GET  /api/projects/[id]/knowledge — list all knowledge items
- POST /api/projects/[id]/knowledge — add/update item by key
- DELETE /api/projects/[id]/knowledge?id=xxx — remove item

OrchestratorChat.tsx:
- Added "Saved to memory" label for save_memory tool calls

Made-with: Cursor

app/api/projects/[projectId]/agent-chat/route.ts

@@ -5,6 +5,84 @@ import { query } from "@/lib/db-postgres";
 
 const AGENT_RUNNER_URL = process.env.AGENT_RUNNER_URL ?? "http://localhost:3333";
 
+// ---------------------------------------------------------------------------
+// Helpers — chat_conversations + fs_knowledge_items
+// ---------------------------------------------------------------------------
+
+async function loadConversation(projectId: string): Promise<any[]> {
+  try {
+    const rows = await query<{ messages: any[] }>(
+      `SELECT messages FROM chat_conversations WHERE project_id = $1`,
+      [projectId]
+    );
+    return rows[0]?.messages ?? [];
+  } catch {
+    return [];
+  }
+}
+
+async function saveConversation(projectId: string, messages: any[]): Promise<void> {
+  try {
+    await query(
+      `INSERT INTO chat_conversations (project_id, messages, updated_at)
+       VALUES ($1, $2::jsonb, NOW())
+       ON CONFLICT (project_id) DO UPDATE
+         SET messages = $2::jsonb, updated_at = NOW()`,
+      [projectId, JSON.stringify(messages)]
+    );
+  } catch (e) {
+    console.error("[agent-chat] Failed to save conversation:", e);
+  }
+}
+
+async function loadKnowledge(projectId: string): Promise<string> {
+  try {
+    const rows = await query<{ data: any }>(
+      `SELECT data FROM fs_knowledge_items WHERE project_id = $1 ORDER BY updated_at DESC LIMIT 50`,
+      [projectId]
+    );
+    if (rows.length === 0) return "";
+    return rows
+      .map((r) => `[${r.data.type ?? "note"}] ${r.data.key}: ${r.data.value}`)
+      .join("\n");
+  } catch {
+    return "";
+  }
+}
+
+async function saveMemoryUpdates(
+  projectId: string,
+  updates: Array<{ key: string; type: string; value: string }>
+): Promise<void> {
+  if (!updates?.length) return;
+  try {
+    for (const u of updates) {
+      // Upsert by project_id + key
+      const existing = await query<{ id: string }>(
+        `SELECT id FROM fs_knowledge_items WHERE project_id = $1 AND data->>'key' = $2 LIMIT 1`,
+        [projectId, u.key]
+      );
+      if (existing.length > 0) {
+        await query(
+          `UPDATE fs_knowledge_items SET data = $1::jsonb, updated_at = NOW() WHERE id = $2`,
+          [JSON.stringify({ key: u.key, type: u.type, value: u.value, source: "ai" }), existing[0].id]
+        );
+      } else {
+        await query(
+          `INSERT INTO fs_knowledge_items (project_id, data) VALUES ($1, $2::jsonb)`,
+          [projectId, JSON.stringify({ key: u.key, type: u.type, value: u.value, source: "ai" })]
+        );
+      }
+    }
+  } catch (e) {
+    console.error("[agent-chat] Failed to save memory updates:", e);
+  }
+}
+
+// ---------------------------------------------------------------------------
+// POST — send a message
+// ---------------------------------------------------------------------------
+
 export async function POST(
   req: NextRequest,
   { params }: { params: Promise<{ projectId: string }> }
@@ -21,7 +99,7 @@ export async function POST(
     return NextResponse.json({ error: '"message" is required' }, { status: 400 });
   }
 
-  // Load project context to inject into the orchestrator session
+  // Load project context
   let projectContext = "";
   try {
     const rows = await query<{ data: any }>(
@@ -40,15 +118,20 @@ export async function POST(
       ].filter(Boolean);
       projectContext = lines.join("\n");
     }
-  } catch {
-    // Non-fatal — orchestrator still works without extra context
-  }
+  } catch { /* non-fatal */ }
 
-  // Use projectId as the session ID so each project has its own conversation
   const sessionId = `project_${projectId}`;
 
-  // First message in a new session? Prepend project context
-  const enrichedMessage = projectContext
+  // Load persistent conversation history and knowledge from DB
+  const [history, knowledgeContext] = await Promise.all([
+    loadConversation(projectId),
+    loadKnowledge(projectId),
+  ]);
+
+  // Enrich user message with project context on the very first message
+  const isFirstMessage = history.length === 0;
+  const enrichedMessage =
+    isFirstMessage && projectContext
       ? `[Project context]\n${projectContext}\n\n[User message]\n${message}`
       : message;
 
@@ -56,8 +139,13 @@ export async function POST(
     const res = await fetch(`${AGENT_RUNNER_URL}/orchestrator/chat`, {
       method: "POST",
       headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ message: enrichedMessage, session_id: sessionId }),
-      signal: AbortSignal.timeout(120_000), // 2 min — agents can take time
+      body: JSON.stringify({
+        message: enrichedMessage,
+        session_id: sessionId,
+        history,
+        knowledge_context: knowledgeContext || undefined,
+      }),
+      signal: AbortSignal.timeout(120_000),
     });
 
     if (!res.ok) {
@@ -69,6 +157,13 @@ export async function POST(
     }
 
     const data = await res.json();
+
+    // Persist conversation and any memory updates the AI generated
+    await Promise.all([
+      saveConversation(projectId, data.history ?? []),
+      saveMemoryUpdates(projectId, data.memoryUpdates ?? []),
+    ]);
+
     return NextResponse.json({
       reply: data.reply,
       reasoning: data.reasoning ?? null,
@@ -76,6 +171,7 @@ export async function POST(
       turns: data.turns ?? 0,
       model: data.model || null,
       sessionId,
+      memoryUpdates: data.memoryUpdates ?? [],
     });
   } catch (err) {
     const msg = err instanceof Error ? err.message : String(err);
@@ -86,7 +182,10 @@ export async function POST(
   }
 }
 
-// Clear session for this project
+// ---------------------------------------------------------------------------
+// DELETE — clear session + conversation history
+// ---------------------------------------------------------------------------
+
 export async function DELETE(
   _req: NextRequest,
   { params }: { params: Promise<{ projectId: string }> }
@@ -99,13 +198,12 @@ export async function DELETE(
   const { projectId } = await params;
   const sessionId = `project_${projectId}`;
 
-  try {
-    await fetch(`${AGENT_RUNNER_URL}/orchestrator/sessions/${sessionId}`, {
-      method: "DELETE",
-    });
-  } catch {
-    // Best-effort
-  }
+  await Promise.all([
+    // Clear in-memory session from agent runner
+    fetch(`${AGENT_RUNNER_URL}/orchestrator/sessions/${sessionId}`, { method: "DELETE" }).catch(() => {}),
+    // Clear persisted conversation from DB
+    query(`DELETE FROM chat_conversations WHERE project_id = $1`, [projectId]).catch(() => {}),
+  ]);
 
   return NextResponse.json({ cleared: true });
 }

app/api/projects/[projectId]/knowledge/route.ts

@@ -0,0 +1,103 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getServerSession } from "next-auth/next";
+import { authOptions } from "@/lib/auth/authOptions";
+import { query } from "@/lib/db-postgres";
+
+async function assertOwnership(projectId: string, email: string): Promise<boolean> {
+  const rows = await query(
+    `SELECT p.id FROM fs_projects p
+     JOIN fs_users u ON u.id = p.user_id
+     WHERE p.id = $1 AND u.data->>'email' = $2 LIMIT 1`,
+    [projectId, email]
+  );
+  return rows.length > 0;
+}
+
+// GET /api/projects/[projectId]/knowledge
+export async function GET(
+  _req: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const session = await getServerSession(authOptions);
+  if (!session?.user?.email) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+  const { projectId } = await params;
+  if (!(await assertOwnership(projectId, session.user.email))) {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+
+  const rows = await query<{ id: string; data: any; updated_at: string }>(
+    `SELECT id, data, updated_at FROM fs_knowledge_items WHERE project_id = $1 ORDER BY updated_at DESC`,
+    [projectId]
+  );
+
+  return NextResponse.json({
+    items: rows.map((r) => ({ id: r.id, ...r.data, updatedAt: r.updated_at })),
+  });
+}
+
+// POST /api/projects/[projectId]/knowledge — add or update an item
+export async function POST(
+  req: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const session = await getServerSession(authOptions);
+  if (!session?.user?.email) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+  const { projectId } = await params;
+  if (!(await assertOwnership(projectId, session.user.email))) {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+
+  const { key, type, value } = await req.json();
+  if (!key || !value) {
+    return NextResponse.json({ error: "key and value are required" }, { status: 400 });
+  }
+
+  const itemType = type ?? "note";
+  const data = JSON.stringify({ key, type: itemType, value, source: "user" });
+
+  // Upsert by key
+  const existing = await query<{ id: string }>(
+    `SELECT id FROM fs_knowledge_items WHERE project_id = $1 AND data->>'key' = $2 LIMIT 1`,
+    [projectId, key]
+  );
+
+  if (existing.length > 0) {
+    await query(
+      `UPDATE fs_knowledge_items SET data = $1::jsonb, updated_at = NOW() WHERE id = $2`,
+      [data, existing[0].id]
+    );
+    return NextResponse.json({ id: existing[0].id, key, type: itemType, value, updated: true });
+  } else {
+    const rows = await query<{ id: string }>(
+      `INSERT INTO fs_knowledge_items (project_id, data) VALUES ($1, $2::jsonb) RETURNING id`,
+      [projectId, data]
+    );
+    return NextResponse.json({ id: rows[0].id, key, type: itemType, value, created: true });
+  }
+}
+
+// DELETE /api/projects/[projectId]/knowledge?id=xxx
+export async function DELETE(
+  req: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const session = await getServerSession(authOptions);
+  if (!session?.user?.email) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+  const { projectId } = await params;
+  if (!(await assertOwnership(projectId, session.user.email))) {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+
+  const id = req.nextUrl.searchParams.get("id");
+  if (!id) return NextResponse.json({ error: "id is required" }, { status: 400 });
+
+  await query(
+    `DELETE FROM fs_knowledge_items WHERE id = $1 AND project_id = $2`,
+    [id, projectId]
+  );
+
+  return NextResponse.json({ deleted: true });
+}

components/OrchestratorChat.tsx

@@ -54,6 +54,7 @@ const TOOL_LABELS: Record<string, string> = {
   gitea_list_issues: "Listed issues",
   gitea_close_issue: "Closed issue",
   gitea_comment_issue: "Added comment",
+  save_memory: "Saved to memory",
 };
 
 function friendlyToolName(raw: string): string {