diff --git a/package.json b/package.json
index f2e1e154..e3f97b82 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "hawk.workers",
     "private": true,
-    "version": "0.1.4",
+    "version": "0.1.5",
     "description": "Hawk workers",
     "repository": "git@github.com:codex-team/hawk.workers.git",
     "license": "BUSL-1.1",
@@ -57,7 +57,7 @@
         "@babel/parser": "^7.26.9",
         "@babel/traverse": "7.26.9",
         "@hawk.so/nodejs": "^3.1.1",
-        "@hawk.so/types": "^0.5.9",
+        "@hawk.so/types": "^0.7.1",
         "@types/amqplib": "^0.8.2",
         "@types/jest": "^29.5.14",
         "@types/mongodb": "^3.5.15",
diff --git a/workers/release/src/index.ts b/workers/release/src/index.ts
index ea9282dc..add96185 100644
--- a/workers/release/src/index.ts
+++ b/workers/release/src/index.ts
@@ -89,11 +89,21 @@ export default class ReleaseWorker extends Worker {
     this.logger.info(`saveRelease: save release for project: ${projectId}, release: ${payload.release}`);
     try {
       const commits = payload.commits;
+      const validCommits = !!commits && this.areCommitsValid(commits);
+      const hasFiles = Array.isArray(payload.files) && payload.files.length > 0;
+
+      if (!validCommits && !hasFiles) {
+        this.logger.debug(`Skipping release ${payload.release} for project ${projectId}: no valid commits or source maps`);
+
+        return;
+      }
+
+      await this.createReleaseIfMissing(projectId, payload.release);
 
       /**
        * Save commits
        */
-      if (commits && this.areCommitsValid(commits)) {
+      if (validCommits) {
         const commitsWithParsedDate: CommitData[] = commits.map(commit => ({
           ...commit,
           date: new Date(commit.date),
@@ -106,13 +116,11 @@ export default class ReleaseWorker extends Worker {
           $set: {
             commits: commitsWithParsedDate,
           },
-        }, {
-          upsert: true,
         });
       }
 
       // save source maps
-      if (payload.files) {
+      if (hasFiles) {
         await this.saveSourceMap(projectId, payload);
       }
     } catch (err) {
@@ -122,6 +130,54 @@ export default class ReleaseWorker extends Worker {
     }
   }
 
+  /**
+   * Create a release once and assign its first-registration sequence.
+   *
+   * The sequence starts at 1 for each project and is based on the order in
+   * which new releases are received by this sequential worker. Repeated
+   * commits or source-map uploads keep the existing sequence.
+   *
+   * @param projectId - project id to bind the corresponding release.
+   * @param release - release name
+   */
+  private async createReleaseIfMissing(projectId: string, release: string): Promise<void> {
+    const existingRelease = await this.releasesCollection.findOne({
+      projectId,
+      release,
+    });
+
+    if (existingRelease) {
+      return;
+    }
+
+    const lastRelease = await this.releasesCollection.findOne({
+      projectId,
+      releaseSequence: { $exists: true },
+    }, {
+      sort: { releaseSequence: -1 },
+      projection: { releaseSequence: 1 },
+    });
+
+    const releaseSequence = (lastRelease?.releaseSequence || 0) + 1;
+
+    try {
+      await this.releasesCollection.insertOne({
+        projectId,
+        release,
+        releaseSequence,
+        commits: [],
+      } as unknown as ReleaseDBScheme);
+    } catch (error) {
+      if ((error as MongoError).code?.toString() === DB_DUPLICATE_KEY_ERROR) {
+        this.logger.debug(`Release ${release} for project ${projectId} was created by another worker`);
+
+        return;
+      }
+
+      throw error;
+    }
+  }
+
   /**
    * Check commtis for the content of all required data
    *
@@ -208,31 +264,8 @@ export default class ReleaseWorker extends Worker {
 
     try {
       /**
-       * - insert new record with saved maps
-       * or
-       * - update previous record with adding new saved maps
+       * Add new source maps to the release created by saveRelease.
        */
-      if (!existedRelease) {
-        this.logger.info('trying insert new release');
-
-        try {
-          await this.releasesCollection.insertOne({
-            projectId: projectId,
-            release: payload.release,
-            files: savedFilesWithoutContent,
-          } as ReleaseDBScheme);
-          this.logger.info('inserted new release');
-        } catch (err) {
-          if ((err as MongoError).code.toString() === DB_DUPLICATE_KEY_ERROR) {
-            this.logger.warn(`Duplicate key on insert, retrying update after small delay`);
-            /* eslint-disable @typescript-eslint/no-magic-numbers */
-            await new Promise(resolve => setTimeout(resolve, 200));
-          } else {
-            throw err;
-          }
-        }
-      }
-
       await this.releasesCollection.findOneAndUpdate({
         projectId: projectId,
         release: payload.release,
diff --git a/workers/release/tests/index.test.ts b/workers/release/tests/index.test.ts
index 24f5f46e..b464d06f 100644
--- a/workers/release/tests/index.test.ts
+++ b/workers/release/tests/index.test.ts
@@ -69,6 +69,16 @@ describe('Release Worker', () => {
     });
     db = connection.db();
     collection = await db.collection<ReleaseDBScheme>('releases');
+    await collection.createIndex(
+      {
+        projectId: 1,
+        release: 1,
+      },
+      {
+        name: 'projectId_release_unique_idx',
+        unique: true,
+      }
+    );
 
     await mockBundle.build();
   });
@@ -184,13 +194,18 @@ describe('Release Worker', () => {
     await expect(release).toMatchObject(parsedReleasePayload);
   });
 
-  test('should update a release if it is already exists', async () => {
+  test('should keep the same release sequence on repeated uploads', async () => {
     await worker.handle({
       projectId,
       type: 'add-release',
       payload: releasePayload,
     });
 
+    const firstRelease = await collection.findOne({
+      projectId,
+      release: releasePayload.release,
+    });
+
     await worker.handle({
       projectId,
       type: 'add-release',
@@ -200,9 +215,37 @@ describe('Release Worker', () => {
       },
     });
 
-    const count = await collection.countDocuments();
+    const secondRelease = await collection.findOne({
+      projectId,
+      release: releasePayload.release,
+    });
+
+    await expect(secondRelease.releaseSequence).toEqual(firstRelease.releaseSequence);
+    await expect(await collection.countDocuments()).toEqual(1);
+  });
+
+  test('should assign increasing sequences to new releases', async () => {
+    await worker.handle({
+      projectId,
+      type: 'add-release',
+      payload: releasePayload,
+    });
+
+    await worker.handle({
+      projectId,
+      type: 'add-release',
+      payload: {
+        ...releasePayload,
+        release: 'Dapper Dragon 2',
+      },
+    });
+
+    const releases = await collection.find({ projectId })
+      .sort({ releaseSequence: 1 })
+      .toArray();
 
-    await expect(count).toEqual(1);
+    await expect(releases).toHaveLength(2);
+    await expect(releases.map(release => release.releaseSequence)).toEqual([1, 2]);
   });
 
   test('should correctly handle release with multiple source maps in a single transaction', async () => {