feat: add issue labels (DB schema, API, and service)

New labels and issue_labels tables with cascade deletes, unique
per-company name constraint. CRUD routes for labels, label filtering
on issue list, and label sync on issue create/update. All issue
responses now include labels array.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/src/schema/index.ts

@@ -12,9 +12,12 @@ export { agentRuntimeState } from "./agent_runtime_state.js";
 export { agentTaskSessions } from "./agent_task_sessions.js";
 export { agentWakeupRequests } from "./agent_wakeup_requests.js";
 export { projects } from "./projects.js";
+export { projectWorkspaces } from "./project_workspaces.js";
 export { projectGoals } from "./project_goals.js";
 export { goals } from "./goals.js";
 export { issues } from "./issues.js";
+export { labels } from "./labels.js";
+export { issueLabels } from "./issue_labels.js";
 export { issueApprovals } from "./issue_approvals.js";
 export { issueComments } from "./issue_comments.js";
 export { assets } from "./assets.js";

packages/db/src/schema/issue_labels.ts

@@ -0,0 +1,20 @@
+import { pgTable, uuid, timestamp, index, primaryKey } from "drizzle-orm/pg-core";
+import { companies } from "./companies.js";
+import { issues } from "./issues.js";
+import { labels } from "./labels.js";
+
+export const issueLabels = pgTable(
+  "issue_labels",
+  {
+    issueId: uuid("issue_id").notNull().references(() => issues.id, { onDelete: "cascade" }),
+    labelId: uuid("label_id").notNull().references(() => labels.id, { onDelete: "cascade" }),
+    companyId: uuid("company_id").notNull().references(() => companies.id, { onDelete: "cascade" }),
+    createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
+  },
+  (table) => ({
+    pk: primaryKey({ columns: [table.issueId, table.labelId], name: "issue_labels_pk" }),
+    issueIdx: index("issue_labels_issue_idx").on(table.issueId),
+    labelIdx: index("issue_labels_label_idx").on(table.labelId),
+    companyIdx: index("issue_labels_company_idx").on(table.companyId),
+  }),
+);

packages/db/src/schema/labels.ts

@@ -0,0 +1,18 @@
+import { pgTable, uuid, text, timestamp, index, uniqueIndex } from "drizzle-orm/pg-core";
+import { companies } from "./companies.js";
+
+export const labels = pgTable(
+  "labels",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    companyId: uuid("company_id").notNull().references(() => companies.id, { onDelete: "cascade" }),
+    name: text("name").notNull(),
+    color: text("color").notNull(),
+    createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
+    updatedAt: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow(),
+  },
+  (table) => ({
+    companyIdx: index("labels_company_idx").on(table.companyId),
+    companyNameIdx: uniqueIndex("labels_company_name_idx").on(table.companyId, table.name),
+  }),
+);