diff --git a/apps/server/src/routes/slack/oauth.test.ts b/apps/server/src/routes/slack/oauth.test.ts
index b62703df..8f718f5d 100644
--- a/apps/server/src/routes/slack/oauth.test.ts
+++ b/apps/server/src/routes/slack/oauth.test.ts
@@ -49,7 +49,8 @@ describe("slack manifest", () => {
     );
   });
 
-  test("subscribes to the events the handler acts on", () => {
+  // Subscribed ahead of their handlers so workspaces reconnect only once.
+  test("subscribes to every event the incident stack needs", () => {
     for (const event of [
       "app_uninstalled",
       "tokens_revoked",
diff --git a/apps/server/src/routes/slack/workspace-resolver.ts b/apps/server/src/routes/slack/workspace-resolver.ts
index a9006e02..09ed0896 100644
--- a/apps/server/src/routes/slack/workspace-resolver.ts
+++ b/apps/server/src/routes/slack/workspace-resolver.ts
@@ -1,4 +1,4 @@
-import { and, db, desc, eq } from "@openstatus/db";
+import { and, db, desc, eq, sql } from "@openstatus/db";
 import {
   integration,
   selectWorkspaceSchema,
@@ -17,6 +17,17 @@ export interface SlackWorkspace {
   scopes?: string;
 }
 
+function parseScopes(raw: string | null): string {
+  try {
+    return (
+      integrationDataSchema.safeParse(JSON.parse(raw ?? "{}")).data?.scopes ??
+      ""
+    );
+  } catch {
+    return "";
+  }
+}
+
 interface IntegrationCredential {
   botToken: string;
   botUserId: string;
@@ -29,7 +40,8 @@ export async function resolveWorkspace(
     .select({
       workspaceId: integration.workspaceId,
       credential: integration.credential,
-      data: integration.data,
+      // Raw text: the JSON-mode column throws on a malformed legacy row.
+      rawData: sql<string | null>`${integration.data}`,
     })
     .from(integration)
     .where(
@@ -64,6 +76,6 @@ export async function resolveWorkspace(
     workspace: parsed.data,
     botToken: credential.botToken,
     botUserId: credential.botUserId ?? "",
-    scopes: integrationDataSchema.safeParse(row.data).data?.scopes ?? "",
+    scopes: parseScopes(row.rawData),
   };
 }
diff --git a/packages/api/src/router/integration.ts b/packages/api/src/router/integration.ts
index 11475bd1..dfbb226f 100644
--- a/packages/api/src/router/integration.ts
+++ b/packages/api/src/router/integration.ts
@@ -36,8 +36,10 @@ export const integrationRouter = createTRPCRouter({
       return integrations.map((i) => ({
         ...i,
         missingScopes:
-          i.name === "slack-agent" && typeof i.data.scopes === "string"
-            ? missingSlackScopes(i.data.scopes)
+          i.name === "slack-agent"
+            ? missingSlackScopes(
+                typeof i.data.scopes === "string" ? i.data.scopes : undefined,
+              )
             : [],
       }));
     } catch (err) {