Q121: a file id keeps the bytes it was recorded with; rewrites get new ids

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/database/migrations/089-file-versions.ts

@@ -0,0 +1,9 @@
+export const fileVersionsSchema = `
+  alter table file_objects add column source_path text;
+  alter table file_objects add column superseded_at text;
+  update file_objects set source_path = storage_path where source_path is null;
+  create index if not exists file_objects_source on file_objects(org_id, source_path, sha256);
+
+  insert into schema_migrations(version, name, applied_at)
+  values (89, 'file_versions', datetime('now'));
+`;

src/main/database/schema.ts

@@ -87,6 +87,7 @@ import { approvalSubjectSnapshotSchema } from "./migrations/085-approval-subject
 import { heldDeliverablesSchema } from "./migrations/086-held-deliverables";
 import { goalAuditorSchema } from "./migrations/087-goal-auditor";
 import { hostAccessNoteSchema } from "./migrations/088-host-access-note";
+import { fileVersionsSchema } from "./migrations/089-file-versions";
 
 interface Migration {
   version: number;
@@ -183,6 +184,7 @@ const MIGRATIONS: Migration[] = [
   { version: 86, name: "held_deliverables", sql: heldDeliverablesSchema },
   { version: 87, name: "goal_auditor", sql: goalAuditorSchema },
   { version: 88, name: "host_access_note", sql: hostAccessNoteSchema },
+  { version: 89, name: "file_versions", sql: fileVersionsSchema },
 ];
 
 const SCHEMA_VERSION = MIGRATIONS[MIGRATIONS.length - 1].version;