feat: add charts API endpoints (GET list, DELETE with cascade)

openspec/changes/multi-chart-management/tasks.md

@@ -9,8 +9,8 @@
 
 ## 2. Charts API Endpoints
 
-- [ ] 2.1 Create `GET /api/charts` endpoint — returns all charts ordered by `created_at` desc
+- [x] 2.1 Create `GET /api/charts` endpoint — returns all charts ordered by `created_at` desc
-- [ ] 2.2 Create `DELETE /api/charts/[id]` endpoint — deletes chart + cascading candles and annotations in a transaction
+- [x] 2.2 Create `DELETE /api/charts/[id]` endpoint — deletes chart + cascading candles and annotations in a transaction
 
 ## 3. Upload Endpoint Changes
 

src/app/api/charts/[id]/route.ts

@@ -0,0 +1,28 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { db } from '@/lib/db';
+import { charts, candles, annotations } from '@/lib/db/schema';
+import { eq } from 'drizzle-orm';
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params;
+  const chartId = parseInt(id, 10);
+
+  if (isNaN(chartId)) {
+    return NextResponse.json({ error: 'Invalid chart ID' }, { status: 400 });
+  }
+
+  const existing = await db.select().from(charts).where(eq(charts.id, chartId)).limit(1);
+  if (existing.length === 0) {
+    return NextResponse.json({ error: 'Chart not found' }, { status: 404 });
+  }
+
+  // Delete in order: annotations, candles, then chart (application-level cascade)
+  await db.delete(annotations).where(eq(annotations.chart_id, chartId));
+  await db.delete(candles).where(eq(candles.chart_id, chartId));
+  await db.delete(charts).where(eq(charts.id, chartId));
+
+  return NextResponse.json({ success: true });
+}

src/app/api/charts/route.ts

@@ -0,0 +1,9 @@
+import { NextResponse } from 'next/server';
+import { db } from '@/lib/db';
+import { charts } from '@/lib/db/schema';
+import { desc } from 'drizzle-orm';
+
+export async function GET() {
+  const allCharts = await db.select().from(charts).orderBy(desc(charts.created_at));
+  return NextResponse.json(allCharts);
+}