refactor: split slack/discord/session maintenance helpers

src/config/sessions/store-migrations.ts

@@ -0,0 +1,27 @@
+import type { SessionEntry } from "./types.js";
+
+export function applySessionStoreMigrations(store: Record<string, SessionEntry>): void {
+  // Best-effort migration: message provider → channel naming.
+  for (const entry of Object.values(store)) {
+    if (!entry || typeof entry !== "object") {
+      continue;
+    }
+    const rec = entry as unknown as Record<string, unknown>;
+    if (typeof rec.channel !== "string" && typeof rec.provider === "string") {
+      rec.channel = rec.provider;
+      delete rec.provider;
+    }
+    if (typeof rec.lastChannel !== "string" && typeof rec.lastProvider === "string") {
+      rec.lastChannel = rec.lastProvider;
+      delete rec.lastProvider;
+    }
+
+    // Best-effort migration: legacy `room` field → `groupChannel` (keep value, prune old key).
+    if (typeof rec.groupChannel !== "string" && typeof rec.room === "string") {
+      rec.groupChannel = rec.room;
+      delete rec.room;
+    } else if ("room" in rec) {
+      delete rec.room;
+    }
+  }
+}