Implement local SQLite backend and reactive UI

packages/shared/src/rpc/modelRpc.test.ts

@@ -1,8 +1,6 @@
 import { afterEach, beforeEach, describe, expect, it } from "vitest";
-import { activeCompanyId } from "../demoData.js";
 import { closeDatabase, type Db, initDatabase } from "../db/database.js";
 import { createRpcHandler } from "../db/rpcHandler.js";
-import { seedDatabase } from "../db/seed.js";
 
 describe("model RPC", () => {
   let db: Db;
@@ -10,7 +8,7 @@ describe("model RPC", () => {
 
   beforeEach(() => {
     db = initDatabase({ inMemory: true });
-    seedDatabase(db);
+    db.prepare("INSERT INTO companies (id, ticker, name, sector, price, change_pct, thesis) VALUES ('aapl', 'AAPL', 'Apple Inc.', 'Technology', 0, 0, '')").run();
     rpc = createRpcHandler(db);
   });
 
@@ -20,7 +18,7 @@ describe("model RPC", () => {
 
   it("rejects out-of-range model cell updates without throwing", async () => {
     const result = await rpc("model.updateCell", {
-      companyId: activeCompanyId,
+      companyId: "aapl",
       tab: "income",
       row: 0,
       col: 999,
@@ -29,4 +27,19 @@ describe("model RPC", () => {
 
     expect(result).toEqual({ ok: true, data: { ok: false, affectedCells: [] } });
   });
+
+  it("returns an empty model when no rows exist yet", async () => {
+    const result = await rpc("model.get", { companyId: "aapl", tab: "operating" });
+    expect(result).toEqual({ ok: true, data: { headers: [], rows: [] } });
+  });
+
+  it("returns a typed failure when model storage is unavailable", async () => {
+    db.prepare("DROP TABLE models").run();
+    const result = await rpc("model.get", { companyId: "aapl", tab: "operating" });
+
+    expect(result.ok).toBe(false);
+    if (result.ok) return;
+    expect(result.error.code).toBe("INTERNAL_ERROR");
+    expect(result.error.message).toBe("Could not load model for company.");
+  });
 });