diff --git a/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/repository/LogSourcemapRepository.java b/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/repository/LogSourcemapRepository.java
index 79e61bb..348d35e 100644
--- a/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/repository/LogSourcemapRepository.java
+++ b/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/repository/LogSourcemapRepository.java
@@ -20,6 +20,14 @@ public interface LogSourcemapRepository extends JpaRepository<LogSourcemapEntity
     Optional<LogSourcemapEntity> findFirstByAppKeyAndPlatformAndAppVersionAndBundleNameOrderByUploadedAtDesc(
             String appKey, String platform, String appVersion, String bundleName);
 
+    /** All records for one version, newest first — used for per-version retention pruning. */
+    List<LogSourcemapEntity> findByAppKeyAndPlatformAndAppVersionAndBundleNameOrderByUploadedAtDesc(
+            String appKey, String platform, String appVersion, String bundleName);
+
+    /** All records for one (appKey, platform, bundleName), newest first — used for version-count pruning. */
+    List<LogSourcemapEntity> findByAppKeyAndPlatformAndBundleNameOrderByUploadedAtDesc(
+            String appKey, String platform, String bundleName);
+
     List<LogSourcemapEntity> findByAppKey(String appKey);
 
     void deleteByAppKey(String appKey);
diff --git a/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/service/SourcemapService.java b/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/service/SourcemapService.java
index 37c5770..9eccfb4 100644
--- a/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/service/SourcemapService.java
+++ b/xuqm-bugcollect-service/src/main/java/com/xuqm/bugcollect/service/SourcemapService.java
@@ -16,6 +16,8 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -103,6 +105,8 @@ public class SourcemapService {
         log.info("Sourcemap uploaded: appKey={} platform={} version={} buildId={} bundle={}",
                 appKey, platform, versionKey, buildId, bundleName);
 
+        pruneSourcemaps(appKey, platform, appVersion, bundleName);
+
         return new SourcemapUploadResponse(
                 entity.getId(), entity.getAppKey(), entity.getPlatform(),
                 entity.getAppVersion(), entity.getBundleName(), entity.getBuildId(), entity.getStorageKey()
@@ -157,6 +161,53 @@ public class SourcemapService {
         return findSourceMap(appKey, platform, appVersion, null, bundleName);
     }
 
+    /**
+     * Enforce retention policy after every upload:
+     *   - per version (appVersion): keep at most 3 records (newest by uploadedAt)
+     *   - per (appKey, platform, bundleName): keep at most 5 distinct appVersions (newest by latest upload)
+     */
+    private void pruneSourcemaps(String appKey, String platform, String appVersion, String bundleName) {
+        // 1. Per-version limit: keep newest 3 buildIds
+        List<LogSourcemapEntity> versionRecords = sourcemapRepository
+                .findByAppKeyAndPlatformAndAppVersionAndBundleNameOrderByUploadedAtDesc(
+                        appKey, platform, appVersion, bundleName);
+        if (versionRecords.size() > 3) {
+            deleteEntities(versionRecords.subList(3, versionRecords.size()));
+        }
+
+        // 2. Version-count limit: keep at most 5 distinct appVersions
+        List<LogSourcemapEntity> allRecords = sourcemapRepository
+                .findByAppKeyAndPlatformAndBundleNameOrderByUploadedAtDesc(appKey, platform, bundleName);
+
+        // Preserve insertion order = newest-first version order
+        LinkedHashSet<String> orderedVersions = new LinkedHashSet<>();
+        for (LogSourcemapEntity r : allRecords) {
+            orderedVersions.add(r.getAppVersion());
+        }
+
+        if (orderedVersions.size() > 5) {
+            List<String> versionList = new ArrayList<>(orderedVersions);
+            Set<String> versionsToDelete = new LinkedHashSet<>(versionList.subList(5, versionList.size()));
+            List<LogSourcemapEntity> excess = allRecords.stream()
+                    .filter(r -> versionsToDelete.contains(r.getAppVersion()))
+                    .toList();
+            deleteEntities(excess);
+            log.info("Pruned {} old-version sourcemap(s) for appKey={} platform={} bundle={}",
+                    excess.size(), appKey, platform, bundleName);
+        }
+    }
+
+    private void deleteEntities(List<LogSourcemapEntity> entities) {
+        for (LogSourcemapEntity entity : entities) {
+            try {
+                Files.deleteIfExists(Paths.get(entity.getStorageKey()));
+            } catch (IOException e) {
+                log.warn("Could not delete sourcemap file {}: {}", entity.getStorageKey(), e.getMessage());
+            }
+            sourcemapRepository.delete(entity);
+        }
+    }
+
     public String readSourceMapContent(String storageKey) throws IOException {
         return Files.readString(Paths.get(storageKey));
     }