refactor: isolate operation ranges and intents

test/tbank-operations-sync.e2e-spec.ts

@@ -115,6 +115,40 @@ describe('Request-driven operations synchronization (SQLite)', () => {
   });
   afterAll(async () => prisma.$disconnect());
 
+  it.each([[false, 1], [true, 1], [false, 2], [true, 2]] as const)(
+    'extends legacy intents in stable priority order (atomic=%s, previousPriority=%s)',
+    async (atomic, previousPriority) => {
+      const run = 'legacy-run';
+      const initial = await repository.request('owner', 'revision', [january, february], run, false, new Set(), previousPriority);
+      if (!initial) throw new Error('Missing work');
+      const key = (range: typeof january) => JSON.stringify([
+        range.accountId, range.from.toISOString(), range.to.toISOString(), '',
+      ]);
+      const march = { ...january, from: february.to, to: new Date('2026-04-01Z') };
+      await prisma.tbankSyncWork.update({
+        where: { id: initial.work.id },
+        data: { intent: { atomic, intervals: [key(february), key(january)] } },
+      });
+      const extended = await repository.request(
+        'owner', 'revision', [january, march], run, false,
+        new Set([initial.work.attemptId]), 1,
+      );
+      expect(extended?.launch).toBe(false);
+      expect(extended?.work.id).toBe(initial.work.id);
+      expect(extended?.work.priority).toBe(1);
+      expect(extended?.work.intent).toEqual({
+        atomic,
+        atomicIntervals: atomic ? [key(february), key(january), key(march)] : [],
+        screenIntervals: previousPriority === 1
+          ? [key(february), key(january), key(march)]
+          : [key(january), key(march)],
+        intervals: previousPriority === 1
+          ? [key(february), key(january), key(march)]
+          : [key(january), key(march), key(february)],
+      });
+    },
+  );
+
   it('joins overlapping account and instrument refresh into one atomic publication group', async () => {
     const gate = deferred<TbankOperationsByCursorResponse>();
     upstream.getOperationsByCursor