diff --git a/backend/ruoyi-modules/ruoyi-aihr/src/main/java/org/dromara/aihr/personal/service/PersonalSpaceService.java b/backend/ruoyi-modules/ruoyi-aihr/src/main/java/org/dromara/aihr/personal/service/PersonalSpaceService.java
index cc502dfd..667c5764 100644
--- a/backend/ruoyi-modules/ruoyi-aihr/src/main/java/org/dromara/aihr/personal/service/PersonalSpaceService.java
+++ b/backend/ruoyi-modules/ruoyi-aihr/src/main/java/org/dromara/aihr/personal/service/PersonalSpaceService.java
@@ -38,6 +38,14 @@ public class PersonalSpaceService {
         }
     }
 
+    /**
+     * Ensures and locks the current owner's space, then validates that one future item of the given size can fit.
+     * This check intentionally does not mutate usage counters. The future ingestion application service must call
+     * it inside its outer transaction and perform the item insert plus counter mutation in that same transaction so
+     * the row lock remains effective. This method must not use an independent transaction.
+     *
+     * @return the locked personal space id
+     */
     @Transactional
     public long reserve(PersonalOwner owner, long bytes) {
         if (bytes < 0 || properties.getMaxItems() <= 0 || properties.getMaxSpaceMb() <= 0) {
@@ -54,14 +62,6 @@ public class PersonalSpaceService {
             throw new ServiceException(QUOTA_EXCEEDED);
         }
 
-        int updated = jdbcTemplate.update("""
-            update aihr_personal_space
-               set used_bytes = used_bytes + ?, item_count = item_count + 1
-             where id = ? and tenant_id = ? and owner_user_id = ?
-            """, bytes, spaceId, owner.tenantId(), owner.userId());
-        if (updated != 1) {
-            throw new ServiceException(QUOTA_EXCEEDED);
-        }
         return spaceId;
     }
 
diff --git a/backend/ruoyi-modules/ruoyi-aihr/src/test/java/org/dromara/aihr/personal/PersonalSpaceServiceTest.java b/backend/ruoyi-modules/ruoyi-aihr/src/test/java/org/dromara/aihr/personal/PersonalSpaceServiceTest.java
index 7d3a506b..259a48d4 100644
--- a/backend/ruoyi-modules/ruoyi-aihr/src/test/java/org/dromara/aihr/personal/PersonalSpaceServiceTest.java
+++ b/backend/ruoyi-modules/ruoyi-aihr/src/test/java/org/dromara/aihr/personal/PersonalSpaceServiceTest.java
@@ -76,12 +76,10 @@ class PersonalSpaceServiceTest {
     }
 
     @Test
-    void reserveUpsertsOwnerSpaceBeforeLockAndAtomicallyConsumesCapacity() {
+    void reserveUpsertsOwnerSpaceBeforeLockAndReturnsWithoutMutatingCounters() {
         JdbcTemplate jdbc = mock(JdbcTemplate.class);
         when(jdbc.queryForMap(contains("from aihr_personal_space"), eq("000000"), eq(101L)))
             .thenReturn(space(7L, 500L * 1024 * 1024, 0L, 0));
-        when(jdbc.update(contains("set used_bytes = used_bytes + ?"),
-            eq(1024L), eq(7L), eq("000000"), eq(101L))).thenReturn(1);
         PersonalSpaceService service = new PersonalSpaceService(jdbc, properties());
 
         assertEquals(7L, service.reserve(new PersonalOwner("000000", 101L, "ext-101"), 1024L));
@@ -90,25 +88,22 @@ class PersonalSpaceServiceTest {
         order.verify(jdbc).update(contains("on duplicate key update"),
             eq("000000"), eq(101L), eq("ext-101"), eq(500L * 1024 * 1024));
         order.verify(jdbc).queryForMap(contains("for update"), eq("000000"), eq(101L));
-        order.verify(jdbc).update(
-            contains("where id = ? and tenant_id = ? and owner_user_id = ?"),
-            eq(1024L), eq(7L), eq("000000"), eq(101L));
         verifyNoMoreInteractions(jdbc);
     }
 
     @Test
-    void reserveZeroBytesStillConsumesOneItemSlot() {
+    void reserveZeroBytesIsValidWithoutMutatingCounters() {
         JdbcTemplate jdbc = mock(JdbcTemplate.class);
         when(jdbc.queryForMap(contains("from aihr_personal_space"), eq("000000"), eq(101L)))
             .thenReturn(space(7L, 1024L, 500L, 3));
-        when(jdbc.update(contains("set used_bytes = used_bytes + ?"),
-            eq(0L), eq(7L), eq("000000"), eq(101L))).thenReturn(1);
         PersonalSpaceService service = new PersonalSpaceService(jdbc, properties());
 
         assertEquals(7L, service.reserve(new PersonalOwner("000000", 101L, null), 0L));
 
-        verify(jdbc).update(contains("item_count = item_count + 1"),
-            eq(0L), eq(7L), eq("000000"), eq(101L));
+        verify(jdbc).update(contains("on duplicate key update"),
+            eq("000000"), eq(101L), eq(null), eq(500L * 1024 * 1024));
+        verify(jdbc).queryForMap(contains("for update"), eq("000000"), eq(101L));
+        verifyNoMoreInteractions(jdbc);
     }
 
     @Test