fix(snapshot): changed insert to upsert when concurrent identical child workflows are running

apps/sim/lib/logs/execution/snapshot/service.test.ts

@@ -1,8 +1,59 @@
-import { describe, expect, it } from 'vitest'
+/**
+ * @vitest-environment node
+ */
+import { databaseMock, drizzleOrmMock, loggerMock } from '@sim/testing'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { mockSchemaExports } = vi.hoisted(() => ({
+  mockSchemaExports: {
+    workflowExecutionSnapshots: {
+      id: 'id',
+      workflowId: 'workflow_id',
+      stateHash: 'state_hash',
+      stateData: 'state_data',
+      createdAt: 'created_at',
+    },
+    workflowExecutionLogs: {
+      id: 'id',
+      stateSnapshotId: 'state_snapshot_id',
+    },
+  },
+}))
+
+vi.mock('@sim/db', () => databaseMock)
+vi.mock('@sim/db/schema', () => mockSchemaExports)
+vi.mock('@sim/logger', () => loggerMock)
+vi.mock('drizzle-orm', () => drizzleOrmMock)
+vi.mock('uuid', () => ({ v4: vi.fn(() => 'generated-uuid-1') }))
+
 import { SnapshotService } from '@/lib/logs/execution/snapshot/service'
 import type { WorkflowState } from '@/lib/logs/types'
 
+const mockState: WorkflowState = {
+  blocks: {
+    block1: {
+      id: 'block1',
+      name: 'Test Agent',
+      type: 'agent',
+      position: { x: 100, y: 200 },
+      subBlocks: {},
+      outputs: {},
+      enabled: true,
+      horizontalHandles: true,
+      advancedMode: false,
+      height: 0,
+    },
+  },
+  edges: [{ id: 'edge1', source: 'block1', target: 'block2' }],
+  loops: {},
+  parallels: {},
+}
+
 describe('SnapshotService', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
   describe('computeStateHash', () => {
     it.concurrent('should generate consistent hashes for identical states', () => {
       const service = new SnapshotService()
@@ -62,7 +113,7 @@ describe('SnapshotService', () => {
         blocks: {
           block1: {
             ...baseState.blocks.block1,
-            position: { x: 500, y: 600 }, // Different position
+            position: { x: 500, y: 600 },
           },
         },
       }
@@ -140,7 +191,7 @@ describe('SnapshotService', () => {
       const state2: WorkflowState = {
         blocks: {},
         edges: [
-          { id: 'edge2', source: 'b', target: 'c' }, // Different order
+          { id: 'edge2', source: 'b', target: 'c' },
           { id: 'edge1', source: 'a', target: 'b' },
         ],
         loops: {},
@@ -219,7 +270,6 @@ describe('SnapshotService', () => {
       const hash = service.computeStateHash(complexState)
       expect(hash).toHaveLength(64)
 
-      // Should be consistent
       const hash2 = service.computeStateHash(complexState)
       expect(hash).toBe(hash2)
     })
@@ -335,4 +385,166 @@ describe('SnapshotService', () => {
       expect(hash1).toHaveLength(64)
     })
   })
+
+  describe('createSnapshotWithDeduplication', () => {
+    it('should use upsert to insert a new snapshot', async () => {
+      const service = new SnapshotService()
+      const workflowId = 'wf-123'
+
+      const mockReturning = vi.fn().mockResolvedValue([
+        {
+          id: 'generated-uuid-1',
+          workflowId,
+          stateHash: 'abc123',
+          stateData: mockState,
+          createdAt: new Date('2026-02-19T00:00:00Z'),
+        },
+      ])
+      const mockOnConflictDoUpdate = vi.fn().mockReturnValue({ returning: mockReturning })
+      const mockValues = vi.fn().mockReturnValue({ onConflictDoUpdate: mockOnConflictDoUpdate })
+      const mockInsert = vi.fn().mockReturnValue({ values: mockValues })
+      databaseMock.db.insert = mockInsert
+
+      const result = await service.createSnapshotWithDeduplication(workflowId, mockState)
+
+      expect(mockInsert).toHaveBeenCalled()
+      expect(mockValues).toHaveBeenCalledWith(
+        expect.objectContaining({
+          id: 'generated-uuid-1',
+          workflowId,
+          stateData: mockState,
+        })
+      )
+      expect(mockOnConflictDoUpdate).toHaveBeenCalledWith(
+        expect.objectContaining({
+          set: expect.any(Object),
+        })
+      )
+      expect(result.snapshot.id).toBe('generated-uuid-1')
+      expect(result.isNew).toBe(true)
+    })
+
+    it('should detect reused snapshot when returned id differs from generated id', async () => {
+      const service = new SnapshotService()
+      const workflowId = 'wf-123'
+
+      const mockReturning = vi.fn().mockResolvedValue([
+        {
+          id: 'existing-snapshot-id',
+          workflowId,
+          stateHash: 'abc123',
+          stateData: mockState,
+          createdAt: new Date('2026-02-19T00:00:00Z'),
+        },
+      ])
+      const mockOnConflictDoUpdate = vi.fn().mockReturnValue({ returning: mockReturning })
+      const mockValues = vi.fn().mockReturnValue({ onConflictDoUpdate: mockOnConflictDoUpdate })
+      const mockInsert = vi.fn().mockReturnValue({ values: mockValues })
+      databaseMock.db.insert = mockInsert
+
+      const result = await service.createSnapshotWithDeduplication(workflowId, mockState)
+
+      expect(result.snapshot.id).toBe('existing-snapshot-id')
+      expect(result.isNew).toBe(false)
+    })
+
+    it('should not throw on concurrent inserts with the same hash', async () => {
+      const service = new SnapshotService()
+      const workflowId = 'wf-123'
+
+      const mockReturningNew = vi.fn().mockResolvedValue([
+        {
+          id: 'generated-uuid-1',
+          workflowId,
+          stateHash: 'abc123',
+          stateData: mockState,
+          createdAt: new Date('2026-02-19T00:00:00Z'),
+        },
+      ])
+      const mockReturningExisting = vi.fn().mockResolvedValue([
+        {
+          id: 'existing-snapshot-id',
+          workflowId,
+          stateHash: 'abc123',
+          stateData: mockState,
+          createdAt: new Date('2026-02-19T00:00:00Z'),
+        },
+      ])
+
+      let callCount = 0
+      databaseMock.db.insert = vi.fn().mockImplementation(() => ({
+        values: vi.fn().mockImplementation(() => ({
+          onConflictDoUpdate: vi.fn().mockImplementation(() => ({
+            returning: callCount++ === 0 ? mockReturningNew : mockReturningExisting,
+          })),
+        })),
+      }))
+
+      const [result1, result2] = await Promise.all([
+        service.createSnapshotWithDeduplication(workflowId, mockState),
+        service.createSnapshotWithDeduplication(workflowId, mockState),
+      ])
+
+      expect(result1.snapshot.id).toBe('generated-uuid-1')
+      expect(result1.isNew).toBe(true)
+      expect(result2.snapshot.id).toBe('existing-snapshot-id')
+      expect(result2.isNew).toBe(false)
+    })
+
+    it('should pass state_data in the ON CONFLICT SET clause', async () => {
+      const service = new SnapshotService()
+      const workflowId = 'wf-123'
+
+      let capturedConflictConfig: Record<string, unknown> | undefined
+      const mockReturning = vi.fn().mockResolvedValue([
+        {
+          id: 'generated-uuid-1',
+          workflowId,
+          stateHash: 'abc123',
+          stateData: mockState,
+          createdAt: new Date('2026-02-19T00:00:00Z'),
+        },
+      ])
+
+      databaseMock.db.insert = vi.fn().mockReturnValue({
+        values: vi.fn().mockReturnValue({
+          onConflictDoUpdate: vi.fn().mockImplementation((config: Record<string, unknown>) => {
+            capturedConflictConfig = config
+            return { returning: mockReturning }
+          }),
+        }),
+      })
+
+      await service.createSnapshotWithDeduplication(workflowId, mockState)
+
+      expect(capturedConflictConfig).toBeDefined()
+      expect(capturedConflictConfig!.target).toBeDefined()
+      expect(capturedConflictConfig!.set).toBeDefined()
+      expect(capturedConflictConfig!.set).toHaveProperty('stateData')
+    })
+
+    it('should always call insert, never a separate select for deduplication', async () => {
+      const service = new SnapshotService()
+      const workflowId = 'wf-123'
+
+      const mockReturning = vi.fn().mockResolvedValue([
+        {
+          id: 'generated-uuid-1',
+          workflowId,
+          stateHash: 'abc123',
+          stateData: mockState,
+          createdAt: new Date('2026-02-19T00:00:00Z'),
+        },
+      ])
+      const mockOnConflictDoUpdate = vi.fn().mockReturnValue({ returning: mockReturning })
+      const mockValues = vi.fn().mockReturnValue({ onConflictDoUpdate: mockOnConflictDoUpdate })
+      databaseMock.db.insert = vi.fn().mockReturnValue({ values: mockValues })
+      databaseMock.db.select = vi.fn()
+
+      await service.createSnapshotWithDeduplication(workflowId, mockState)
+
+      expect(databaseMock.db.insert).toHaveBeenCalledTimes(1)
+      expect(databaseMock.db.select).not.toHaveBeenCalled()
+    })
+  })
 })

apps/sim/lib/logs/execution/snapshot/service.ts

@@ -2,7 +2,7 @@ import { createHash } from 'crypto'
 import { db } from '@sim/db'
 import { workflowExecutionLogs, workflowExecutionSnapshots } from '@sim/db/schema'
 import { createLogger } from '@sim/logger'
-import { and, eq, lt, notExists } from 'drizzle-orm'
+import { and, eq, lt, notExists, sql } from 'drizzle-orm'
 import { v4 as uuidv4 } from 'uuid'
 import type {
   SnapshotService as ISnapshotService,
@@ -28,58 +28,41 @@ export class SnapshotService implements ISnapshotService {
     workflowId: string,
     state: WorkflowState
   ): Promise<SnapshotCreationResult> {
-    // Hash the position-less state for deduplication (functional equivalence)
     const stateHash = this.computeStateHash(state)
 
-    const existingSnapshot = await this.getSnapshotByHash(workflowId, stateHash)
-    if (existingSnapshot) {
-      let refreshedState: WorkflowState = existingSnapshot.stateData
-      try {
-        await db
-          .update(workflowExecutionSnapshots)
-          .set({ stateData: state })
-          .where(eq(workflowExecutionSnapshots.id, existingSnapshot.id))
-        refreshedState = state
-      } catch (error) {
-        logger.warn(
-          `Failed to refresh snapshot stateData for ${existingSnapshot.id}, continuing with existing data`,
-          error
-        )
-      }
-
-      logger.info(
-        `Reusing existing snapshot for workflow ${workflowId} (hash: ${stateHash.slice(0, 12)}...)`
-      )
-      return {
-        snapshot: { ...existingSnapshot, stateData: refreshedState },
-        isNew: false,
-      }
-    }
-
-    // Store the FULL state (including positions) so we can recreate the exact workflow
-    // Even though we hash without positions, we want to preserve the complete state
     const snapshotData: WorkflowExecutionSnapshotInsert = {
       id: uuidv4(),
       workflowId,
       stateHash,
       stateData: state,
     }
 
-    const [newSnapshot] = await db
+    const [upsertedSnapshot] = await db
       .insert(workflowExecutionSnapshots)
       .values(snapshotData)
+      .onConflictDoUpdate({
+        target: [workflowExecutionSnapshots.workflowId, workflowExecutionSnapshots.stateHash],
+        set: {
+          stateData: sql`excluded.state_data`,
+        },
+      })
       .returning()
 
+    const isNew = upsertedSnapshot.id === snapshotData.id
+
     logger.info(
-      `Created new snapshot for workflow ${workflowId} (hash: ${stateHash.slice(0, 12)}..., blocks: ${Object.keys(state.blocks || {}).length})`
+      isNew
+        ? `Created new snapshot for workflow ${workflowId} (hash: ${stateHash.slice(0, 12)}..., blocks: ${Object.keys(state.blocks || {}).length})`
+        : `Reusing existing snapshot for workflow ${workflowId} (hash: ${stateHash.slice(0, 12)}...)`
     )
+
     return {
       snapshot: {
-        ...newSnapshot,
-        stateData: newSnapshot.stateData as WorkflowState,
-        createdAt: newSnapshot.createdAt.toISOString(),
+        ...upsertedSnapshot,
+        stateData: upsertedSnapshot.stateData as WorkflowState,
+        createdAt: upsertedSnapshot.createdAt.toISOString(),
       },
-      isNew: true,
+      isNew,
     }
   }