Q30: documents keep every version

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

src/main/database/migrations/065-document-versions.ts

@@ -0,0 +1,26 @@
+export const documentVersionsSchema = `
+  alter table documents add column version integer not null default 1;
+
+  create table if not exists document_versions (
+    id text primary key,
+    org_id text not null references organizations(id) on delete cascade,
+    document_id text not null,
+    version integer not null,
+    title text not null,
+    content text not null,
+    status text not null,
+    changed_by_type text not null,
+    changed_by_id text,
+    reason text not null,
+    created_at text not null,
+    unique (document_id, version)
+  );
+
+  insert into document_versions(id, org_id, document_id, version, title, content, status, changed_by_type, changed_by_id, reason, created_at)
+  select 'dov_' || lower(hex(randomblob(16))), org_id, id, 1, title, content, status,
+         case when author_agent_id is null then 'employee' else 'agent' end, author_agent_id, 'created', created_at
+  from documents;
+
+  insert into schema_migrations(version, name, applied_at)
+  values (65, 'document_versions', datetime('now'));
+`;

src/main/database/schema.ts

@@ -63,6 +63,7 @@ import { taskRunContextSchema } from "./migrations/061-task-run-context";
 import { providerContextWindowSchema } from "./migrations/062-provider-context-window";
 import { knowledgeScopeSchema } from "./migrations/063-knowledge-scope";
 import { knowledgeRevisionsSchema } from "./migrations/064-knowledge-revisions";
+import { documentVersionsSchema } from "./migrations/065-document-versions";
 
 interface Migration {
   version: number;
@@ -135,6 +136,7 @@ const MIGRATIONS: Migration[] = [
   { version: 62, name: "provider_context_window", sql: providerContextWindowSchema },
   { version: 63, name: "knowledge_scope", sql: knowledgeScopeSchema },
   { version: 64, name: "knowledge_revisions", sql: knowledgeRevisionsSchema },
+  { version: 65, name: "document_versions", sql: documentVersionsSchema },
 ];
 
 const SCHEMA_VERSION = MIGRATIONS[MIGRATIONS.length - 1].version;