fix(core): soft-delete source connections with deleted_at

Migration 0003 adds source_connections.deleted_at. deleteConnection sets it; listing, lookups,
updates, the scheduler and the sync handler ignore deleted connections, so a paused
credential-less connection stays visible and can be resumed.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/db/src/migrations/0003_source_connections_deleted_at.ts

@@ -0,0 +1,13 @@
+import type { Kysely } from "kysely";
+import type { Migration } from "kysely/migration";
+
+/** Soft delete for source connections: a deleted connection is distinct from one the user merely paused. */
+export const sourceConnectionsDeletedAt: Migration = {
+  async up(db: Kysely<any>) {
+    await db.schema.alterTable("source_connections").addColumn("deleted_at", "text").execute();
+  },
+
+  async down(db: Kysely<any>) {
+    await db.schema.alterTable("source_connections").dropColumn("deleted_at").execute();
+  },
+};

packages/db/src/migrations/index.ts

@@ -1,9 +1,11 @@
 import type { Migration } from "kysely/migration";
 import { initial } from "./0001_initial.ts";
 import { worksPositionUnique } from "./0002_works_position_unique.ts";
+import { sourceConnectionsDeletedAt } from "./0003_source_connections_deleted_at.ts";
 
 /** All migrations, keyed by sortable name. Imported statically so bundles need no filesystem. */
 export const migrations: Record<string, Migration> = {
   "0001_initial": initial,
   "0002_works_position_unique": worksPositionUnique,
+  "0003_source_connections_deleted_at": sourceConnectionsDeletedAt,
 };

packages/db/src/schema.ts

@@ -269,6 +269,8 @@ export interface SourceConnectionsTable {
   status: ConnectionStatus;
   last_run_at: string | null;
   created_at: string;
+  /** Set by `deleteConnection`; deleted connections are hidden, never scheduled and never synced. */
+  deleted_at: string | null;
 }
 
 export interface SourceRunsTable {