diff --git a/packages/db/src/migrations/0108_document_company_cascade.sql b/packages/db/src/migrations/0108_document_company_cascade.sql
new file mode 100644
index 00000000000..948c1347685
--- /dev/null
+++ b/packages/db/src/migrations/0108_document_company_cascade.sql
@@ -0,0 +1,31 @@
+DO $$ BEGIN
+	IF EXISTS (
+		SELECT 1 FROM "pg_constraint" WHERE "conname" = 'document_revisions_company_id_companies_id_fk'
+	) THEN
+		ALTER TABLE "document_revisions" DROP CONSTRAINT "document_revisions_company_id_companies_id_fk";
+	END IF;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+	IF NOT EXISTS (
+		SELECT 1 FROM "pg_constraint" WHERE "conname" = 'document_revisions_company_id_companies_id_fk'
+	) THEN
+		ALTER TABLE "document_revisions" ADD CONSTRAINT "document_revisions_company_id_companies_id_fk" FOREIGN KEY ("company_id") REFERENCES "public"."companies"("id") ON DELETE cascade ON UPDATE no action;
+	END IF;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+	IF EXISTS (
+		SELECT 1 FROM "pg_constraint" WHERE "conname" = 'documents_company_id_companies_id_fk'
+	) THEN
+		ALTER TABLE "documents" DROP CONSTRAINT "documents_company_id_companies_id_fk";
+	END IF;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+	IF NOT EXISTS (
+		SELECT 1 FROM "pg_constraint" WHERE "conname" = 'documents_company_id_companies_id_fk'
+	) THEN
+		ALTER TABLE "documents" ADD CONSTRAINT "documents_company_id_companies_id_fk" FOREIGN KEY ("company_id") REFERENCES "public"."companies"("id") ON DELETE cascade ON UPDATE no action;
+	END IF;
+END $$;
diff --git a/packages/db/src/migrations/meta/_journal.json b/packages/db/src/migrations/meta/_journal.json
index 04c7aa50cc1..be7eb6feffb 100644
--- a/packages/db/src/migrations/meta/_journal.json
+++ b/packages/db/src/migrations/meta/_journal.json
@@ -771,6 +771,13 @@
       "when": 1781902300000,
       "tag": "0109_routine_description_annotations",
       "breakpoints": true
+    },
+    {
+      "idx": 108,
+      "version": "7",
+      "when": 1781902300000,
+      "tag": "0108_document_company_cascade",
+      "breakpoints": true
     }
   ]
 }
diff --git a/packages/db/src/schema/document_revisions.ts b/packages/db/src/schema/document_revisions.ts
index cdc8a18f537..d966b33329e 100644
--- a/packages/db/src/schema/document_revisions.ts
+++ b/packages/db/src/schema/document_revisions.ts
@@ -8,7 +8,7 @@ export const documentRevisions = pgTable(
   "document_revisions",
   {
     id: uuid("id").primaryKey().defaultRandom(),
-    companyId: uuid("company_id").notNull().references(() => companies.id),
+    companyId: uuid("company_id").notNull().references(() => companies.id, { onDelete: "cascade" }),
     documentId: uuid("document_id").notNull().references(() => documents.id, { onDelete: "cascade" }),
     revisionNumber: integer("revision_number").notNull(),
     title: text("title"),
diff --git a/packages/db/src/schema/documents.ts b/packages/db/src/schema/documents.ts
index 7dcc0f4578d..14039e1d37e 100644
--- a/packages/db/src/schema/documents.ts
+++ b/packages/db/src/schema/documents.ts
@@ -7,7 +7,7 @@ export const documents = pgTable(
   "documents",
   {
     id: uuid("id").primaryKey().defaultRandom(),
-    companyId: uuid("company_id").notNull().references(() => companies.id),
+    companyId: uuid("company_id").notNull().references(() => companies.id, { onDelete: "cascade" }),
     title: text("title"),
     format: text("format").notNull().default("markdown"),
     latestBody: text("latest_body").notNull(),
diff --git a/server/src/routes/openapi.ts b/server/src/routes/openapi.ts
index 82ac734ef6a..808fd7d9557 100644
--- a/server/src/routes/openapi.ts
+++ b/server/src/routes/openapi.ts
@@ -4544,6 +4544,8 @@ registerCurrentRoute({
 for (const route of [
   ["get", "/api/routines/{id}/revisions", "List routine revisions"],
   ["post", "/api/routines/{id}/revisions/{revisionId}/restore", "Restore a routine revision"],
+  ["get", "/api/routines/{id}/description/annotations", "List routine description annotation threads"],
+  ["get", "/api/routines/{id}/description/annotations/{threadId}", "Get a routine description annotation thread"],
 ] as const) {
   registerCurrentRoute({
     method: route[0],
@@ -4553,6 +4555,32 @@ for (const route of [
   });
 }
 
+registerCurrentRoute({
+  method: "post",
+  path: "/api/routines/{id}/description/annotations",
+  tags: ["routines"],
+  summary: "Create a routine description annotation thread",
+  body: createDocumentAnnotationThreadSchema,
+  responses: { 201: r.ok(), 400: r.badRequest, 401: r.unauthorized, 404: r.notFound },
+});
+
+registerCurrentRoute({
+  method: "post",
+  path: "/api/routines/{id}/description/annotations/{threadId}/comments",
+  tags: ["routines"],
+  summary: "Add a routine description annotation comment",
+  body: createDocumentAnnotationCommentSchema,
+  responses: { 201: r.ok(), 400: r.badRequest, 401: r.unauthorized, 404: r.notFound },
+});
+
+registerCurrentRoute({
+  method: "patch",
+  path: "/api/routines/{id}/description/annotations/{threadId}",
+  tags: ["routines"],
+  summary: "Update a routine description annotation thread",
+  body: updateDocumentAnnotationThreadSchema,
+});
+
 const pluginLocalFolderRequestSchema = z.object({
   path: z.string().min(1),
   access: z.enum(["read", "readWrite"]).optional(),