Allow message retries for "pending" status, refactor message context handling, remove workspace import/export routes, and add SQLite-backed rate limiting.

test/attachments.test.js

@@ -75,7 +75,7 @@ async function setup(t, {visionResult = null, replyResult = null, visionModel =
     const image = format => sharp({create: {width: 20, height: 10, channels: 3, background: "blue"}}).toFormat(format).toBuffer();
     const chat = async () => (await (await api("/chats", {title: "Image test"})).json()).chat.id;
     return {app, api, upload, image, register, directory, requests, order, searchQueries, chat,
-        failVision: () => { visionFailure = true; }, holdVision: () => { holdVision = true; return visionStarted; },
+        failVision: () => { visionFailure = true; }, recoverVision: () => { visionFailure = false; }, holdVision: () => { holdVision = true; return visionStarted; },
         get visionAborted() { return visionAborted; }};
 }
 
@@ -239,6 +239,26 @@ test("vision failure prevents an ungrounded answer and malformed JSON falls back
     assert.throws(() => parseVisionAnalysis(""));
 });
 
+test("resuming a failed image turn reuses its branch node and attachment", async t => {
+    const s = await setup(t);
+    const attachment = await (await s.upload(await s.image("png"))).json();
+    const chatId = await s.chat();
+    s.failVision();
+    const failedWire = await (await s.api("/chat/stream", {chatId, message: "Describe the image", attachments: [attachment.id]})).text();
+    assert.match(failedWire, /event: error/);
+    const failedMessages = (await (await s.api(`/chats/${chatId}/messages`)).json()).messages;
+    const interrupted = failedMessages.find(message => message.role === "user");
+    assert.equal(interrupted.deliveryStatus, "failed");
+    s.recoverVision();
+    const resumedWire = await (await s.api("/chat/stream", {chatId, message: interrupted.content,
+        attachments: [attachment.id], userMessageId: interrupted.id})).text();
+    assert.match(resumedWire, /event: done/);
+    const messages = (await (await s.api(`/chats/${chatId}/messages`)).json()).messages;
+    assert.equal(messages.filter(message => message.role === "user").length, 1);
+    assert.equal(messages[0].attachments[0].id, attachment.id);
+    assert.equal(messages[0].deliveryStatus, "complete");
+});
+
 test("browser disconnect cancels in-progress vision and never starts the final model", async t => {
     const s = await setup(t);
     const attachment = await (await s.upload(await s.image("png"))).json();