Defer promotion snapshots to campaign activation

src/lib/server/db/index.ts

@@ -317,6 +317,9 @@ export function db(): Database.Database {
         handle.exec(schemaSql);
         migrateProvisioningActions(handle);
         migrateWatchdogConstraints(handle);
+        migrateTable(handle, 'deployment_files', [
+            { name: 'snapshot_pending', ddl: 'ALTER TABLE deployment_files ADD COLUMN snapshot_pending INTEGER NOT NULL DEFAULT 0' }
+        ]);
         migrateTable(handle, 'restart_rollout', [{ name: 'operation_id', ddl: 'ALTER TABLE restart_rollout ADD COLUMN operation_id TEXT' }]);
         migrateTable(handle, 'server_deployments', [
             { name: 'submitted_at', ddl: 'ALTER TABLE server_deployments ADD COLUMN submitted_at TEXT' },

src/lib/server/db/schema.sql

@@ -365,7 +365,9 @@ CREATE TABLE IF NOT EXISTS deployment_files (
     sha256_before  TEXT,
     sha256_after   TEXT,
     content_before BLOB,
-    content_after  BLOB
+    content_after  BLOB,
+    -- An unknown before image is distinct from a confirmed absent file.
+    snapshot_pending INTEGER NOT NULL DEFAULT 0
 );
 
 CREATE INDEX IF NOT EXISTS idx_deployment_files_dep ON deployment_files(deployment_id);