diff --git a/API/app/application/__init__.py b/API/app/application/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/API/app/controllers/__init__.py b/API/app/controllers/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/API/app/database/__init__.py b/API/app/database/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/API/app/database/database.py b/API/app/database/database.py
new file mode 100644
index 0000000..9558185
--- /dev/null
+++ b/API/app/database/database.py
@@ -0,0 +1,12 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.domain.models import Base
+from app.settings import settings
+
+engine = create_engine(settings.DATABASE_URL)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def init_db():
+    Base.metadata.create_all(bind=engine)
diff --git a/API/app/infrastructure/database/dependencies.py b/API/app/database/dependencies.py
similarity index 69%
rename from API/app/infrastructure/database/dependencies.py
rename to API/app/database/dependencies.py
index 4cf28dc..21b91e8 100644
--- a/API/app/infrastructure/database/dependencies.py
+++ b/API/app/database/dependencies.py
@@ -1,5 +1,5 @@
 from sqlalchemy.orm import Session
-from app.infrastructure.database.database import SessionLocal
+from app.database.database import SessionLocal
 
 
 def get_db() -> Session:
diff --git a/API/app/domain/__init__.py b/API/app/domain/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/API/app/domain/entities/__init__.py b/API/app/domain/entities/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/API/app/infrastructure/database/models/__init__.py b/API/app/domain/models/__init__.py
similarity index 100%
rename from API/app/infrastructure/database/models/__init__.py
rename to API/app/domain/models/__init__.py
diff --git a/API/app/infrastructure/database/models/answer_files.py b/API/app/domain/models/answer_files.py
similarity index 89%
rename from API/app/infrastructure/database/models/answer_files.py
rename to API/app/domain/models/answer_files.py
index 51c6d1e..3ac6965 100644
--- a/API/app/infrastructure/database/models/answer_files.py
+++ b/API/app/domain/models/answer_files.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, ForeignKey
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class AnswerFile(Base):
diff --git a/API/app/infrastructure/database/models/answer_options.py b/API/app/domain/models/answer_options.py
similarity index 91%
rename from API/app/infrastructure/database/models/answer_options.py
rename to API/app/domain/models/answer_options.py
index 1aab522..4a89c89 100644
--- a/API/app/infrastructure/database/models/answer_options.py
+++ b/API/app/domain/models/answer_options.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, Boolean, ForeignKey
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class AnswerOption(Base):
diff --git a/API/app/infrastructure/database/models/appeals.py b/API/app/domain/models/appeals.py
similarity index 95%
rename from API/app/infrastructure/database/models/appeals.py
rename to API/app/domain/models/appeals.py
index 1fca48e..8ff9ead 100644
--- a/API/app/infrastructure/database/models/appeals.py
+++ b/API/app/domain/models/appeals.py
@@ -4,7 +4,7 @@ from sqlalchemy import Column, Integer, String, DateTime, Enum, ForeignKey
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class AppealStatusEnum(PyEnum):
diff --git a/API/app/infrastructure/database/models/appeals_topics.py b/API/app/domain/models/appeals_topics.py
similarity index 86%
rename from API/app/infrastructure/database/models/appeals_topics.py
rename to API/app/domain/models/appeals_topics.py
index cf2e32e..9e5adb1 100644
--- a/API/app/infrastructure/database/models/appeals_topics.py
+++ b/API/app/domain/models/appeals_topics.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, VARCHAR
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class AppealsTopic(Base):
diff --git a/API/app/infrastructure/database/models/categories.py b/API/app/domain/models/categories.py
similarity index 87%
rename from API/app/infrastructure/database/models/categories.py
rename to API/app/domain/models/categories.py
index bca2a3f..e067bcd 100644
--- a/API/app/infrastructure/database/models/categories.py
+++ b/API/app/domain/models/categories.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, VARCHAR, String
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Category(Base):
diff --git a/API/app/infrastructure/database/models/course_students.py b/API/app/domain/models/course_students.py
similarity index 92%
rename from API/app/infrastructure/database/models/course_students.py
rename to API/app/domain/models/course_students.py
index c761c1f..5f593e2 100644
--- a/API/app/infrastructure/database/models/course_students.py
+++ b/API/app/domain/models/course_students.py
@@ -2,7 +2,7 @@ from sqlalchemy import Column, Integer, ForeignKey, Date, Boolean
 from sqlalchemy.sql import func
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class CourseStudent(Base):
diff --git a/API/app/infrastructure/database/models/courses.py b/API/app/domain/models/courses.py
similarity index 94%
rename from API/app/infrastructure/database/models/courses.py
rename to API/app/domain/models/courses.py
index 9e54e4d..89e781a 100644
--- a/API/app/infrastructure/database/models/courses.py
+++ b/API/app/domain/models/courses.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, VARCHAR, String, ForeignKey
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Course(Base):
diff --git a/API/app/infrastructure/database/models/lectures.py b/API/app/domain/models/lectures.py
similarity index 89%
rename from API/app/infrastructure/database/models/lectures.py
rename to API/app/domain/models/lectures.py
index f8d9495..3f3bdcc 100644
--- a/API/app/infrastructure/database/models/lectures.py
+++ b/API/app/domain/models/lectures.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, ForeignKey
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Lectures(Base):
diff --git a/API/app/infrastructure/database/models/lessons.py b/API/app/domain/models/lessons.py
similarity index 90%
rename from API/app/infrastructure/database/models/lessons.py
rename to API/app/domain/models/lessons.py
index 9ecc5bb..d19543b 100644
--- a/API/app/infrastructure/database/models/lessons.py
+++ b/API/app/domain/models/lessons.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, ForeignKey, VARCHAR
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Lesson(Base):
diff --git a/API/app/infrastructure/database/models/notification_types.py b/API/app/domain/models/notification_types.py
similarity index 88%
rename from API/app/infrastructure/database/models/notification_types.py
rename to API/app/domain/models/notification_types.py
index 67c5672..a3d1017 100644
--- a/API/app/infrastructure/database/models/notification_types.py
+++ b/API/app/domain/models/notification_types.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, VARCHAR, String
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class NotificationType(Base):
diff --git a/API/app/infrastructure/database/models/notifications.py b/API/app/domain/models/notifications.py
similarity index 94%
rename from API/app/infrastructure/database/models/notifications.py
rename to API/app/domain/models/notifications.py
index 1707fed..5b4d520 100644
--- a/API/app/infrastructure/database/models/notifications.py
+++ b/API/app/domain/models/notifications.py
@@ -2,7 +2,7 @@ from sqlalchemy import Column, Integer, Boolean, String, DateTime, ForeignKey
 from sqlalchemy.sql import func
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Notification(Base):
diff --git a/API/app/infrastructure/database/models/roles.py b/API/app/domain/models/roles.py
similarity index 85%
rename from API/app/infrastructure/database/models/roles.py
rename to API/app/domain/models/roles.py
index e9435a0..77ac7e9 100644
--- a/API/app/infrastructure/database/models/roles.py
+++ b/API/app/domain/models/roles.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, VARCHAR
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Role(Base):
diff --git a/API/app/infrastructure/database/models/step_tasks.py b/API/app/domain/models/step_tasks.py
similarity index 93%
rename from API/app/infrastructure/database/models/step_tasks.py
rename to API/app/domain/models/step_tasks.py
index 4821c4f..cb0d31a 100644
--- a/API/app/infrastructure/database/models/step_tasks.py
+++ b/API/app/domain/models/step_tasks.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, ForeignKey
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class StepTask(Base):
diff --git a/API/app/infrastructure/database/models/step_types.py b/API/app/domain/models/step_types.py
similarity index 87%
rename from API/app/infrastructure/database/models/step_types.py
rename to API/app/domain/models/step_types.py
index 9ad8f3c..192656b 100644
--- a/API/app/infrastructure/database/models/step_types.py
+++ b/API/app/domain/models/step_types.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, VARCHAR
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class StepType(Base):
diff --git a/API/app/infrastructure/database/models/steps.py b/API/app/domain/models/steps.py
similarity index 92%
rename from API/app/infrastructure/database/models/steps.py
rename to API/app/domain/models/steps.py
index 680a206..bffb177 100644
--- a/API/app/infrastructure/database/models/steps.py
+++ b/API/app/domain/models/steps.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, ForeignKey, VARCHAR
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class Step(Base):
diff --git a/API/app/infrastructure/database/models/task_answers.py b/API/app/domain/models/task_answers.py
similarity index 93%
rename from API/app/infrastructure/database/models/task_answers.py
rename to API/app/domain/models/task_answers.py
index 4f7bcc2..eb8559b 100644
--- a/API/app/infrastructure/database/models/task_answers.py
+++ b/API/app/domain/models/task_answers.py
@@ -2,7 +2,7 @@ from sqlalchemy import Column, Integer, ForeignKey, DateTime, String, Boolean
 from sqlalchemy.sql import func
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class TaskAnswer(Base):
diff --git a/API/app/infrastructure/database/models/task_files.py b/API/app/domain/models/task_files.py
similarity index 89%
rename from API/app/infrastructure/database/models/task_files.py
rename to API/app/domain/models/task_files.py
index 6ee5b5a..7978629 100644
--- a/API/app/infrastructure/database/models/task_files.py
+++ b/API/app/domain/models/task_files.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, ForeignKey
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class TaskFile(Base):
diff --git a/API/app/infrastructure/database/models/task_types.py b/API/app/domain/models/task_types.py
similarity index 87%
rename from API/app/infrastructure/database/models/task_types.py
rename to API/app/domain/models/task_types.py
index a914587..16e3f1d 100644
--- a/API/app/infrastructure/database/models/task_types.py
+++ b/API/app/domain/models/task_types.py
@@ -1,7 +1,7 @@
 from sqlalchemy import Column, Integer, String, VARCHAR
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class TaskType(Base):
diff --git a/API/app/infrastructure/database/models/test_answers.py b/API/app/domain/models/test_answers.py
similarity index 92%
rename from API/app/infrastructure/database/models/test_answers.py
rename to API/app/domain/models/test_answers.py
index 025e723..f9ac4c6 100644
--- a/API/app/infrastructure/database/models/test_answers.py
+++ b/API/app/domain/models/test_answers.py
@@ -2,7 +2,7 @@ from sqlalchemy import Column, Integer, ForeignKey, DateTime
 from sqlalchemy.sql import func
 from sqlalchemy.orm import relationship
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class TestAnswer(Base):
diff --git a/API/app/infrastructure/database/models/users.py b/API/app/domain/models/users.py
similarity index 97%
rename from API/app/infrastructure/database/models/users.py
rename to API/app/domain/models/users.py
index 5f7dc9d..469516e 100644
--- a/API/app/infrastructure/database/models/users.py
+++ b/API/app/domain/models/users.py
@@ -5,7 +5,7 @@ from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from werkzeug.security import check_password_hash, generate_password_hash
 
-from app.infrastructure.database.models import Base
+from app.domain.models import Base
 
 
 class UserGenderEnum(PyEnum):
diff --git a/API/app/infrastructure/__init__.py b/API/app/infrastructure/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/API/app/infrastructure/database/database.py b/API/app/infrastructure/database/database.py
deleted file mode 100644
index 6fe6eb5..0000000
--- a/API/app/infrastructure/database/database.py
+++ /dev/null
@@ -1,39 +0,0 @@
-import os
-
-from dotenv import load_dotenv
-from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
-
-from app.infrastructure.database.models import Base
-
-load_dotenv()
-
-SQLALCHEMY_DATABASE_URL = os.getenv("DATABASE_URL")
-
-engine = create_engine(SQLALCHEMY_DATABASE_URL)
-SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
-
-
-def init_db():
-    import app.infrastructure.database.models.answer_files
-    import app.infrastructure.database.models.answer_options
-    import app.infrastructure.database.models.appeals
-    import app.infrastructure.database.models.appeals_topics
-    import app.infrastructure.database.models.categories
-    import app.infrastructure.database.models.course_students
-    import app.infrastructure.database.models.courses
-    import app.infrastructure.database.models.lectures
-    import app.infrastructure.database.models.lessons
-    import app.infrastructure.database.models.notification_types
-    import app.infrastructure.database.models.notifications
-    import app.infrastructure.database.models.roles
-    import app.infrastructure.database.models.step_tasks
-    import app.infrastructure.database.models.step_types
-    import app.infrastructure.database.models.steps
-    import app.infrastructure.database.models.task_answers
-    import app.infrastructure.database.models.task_files
-    import app.infrastructure.database.models.task_types
-    import app.infrastructure.database.models.test_answers
-    import app.infrastructure.database.models.users
-
-    Base.metadata.create_all(bind=engine)
diff --git a/API/app/main.py b/API/app/main.py
index bc3eeb3..dea52a7 100644
--- a/API/app/main.py
+++ b/API/app/main.py
@@ -1,6 +1,6 @@
 import logging
 
-from app.infrastructure.database.database import init_db
+from app.database.database import init_db
 from fastapi import FastAPI
 from starlette.middleware.cors import CORSMiddleware
 
@@ -16,4 +16,4 @@ app.add_middleware(
     allow_headers=['*'],
 )
 
-init_db()
\ No newline at end of file
+init_db()
diff --git a/API/app/settings.py b/API/app/settings.py
new file mode 100644
index 0000000..e2b16d4
--- /dev/null
+++ b/API/app/settings.py
@@ -0,0 +1,19 @@
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    DATABASE_URL: str
+    SECRET_KEY: str
+    ALGORITHM: str
+    APP_PREFIX: str = '/api/v1'
+
+    class Config:
+        env_file = '.env'
+        env_file_encoding = 'utf-8'
+
+
+settings = Settings()
+
+
+def get_auth_data():
+    return {'secret_key': settings.SECRET_KEY, 'algorithm': settings.ALGORITHM}
diff --git a/API/req.txt b/API/req.txt
new file mode 100644
index 0000000..bdb4348
--- /dev/null
+++ b/API/req.txt
@@ -0,0 +1,13 @@
+annotated-types==0.7.0
+asn1crypto==1.5.1
+greenlet==3.1.1
+pg8000==1.31.2
+pydantic==2.10.6
+pydantic-settings==2.7.1
+pydantic_core==2.27.2
+python-dateutil==2.9.0.post0
+python-dotenv==1.0.1
+scramp==1.4.5
+six==1.17.0
+SQLAlchemy==2.0.38
+typing_extensions==4.12.2