diff --git a/backend/alembic/env.py b/backend/alembic/env.py
index 6f81185..0a0a94b 100644
--- a/backend/alembic/env.py
+++ b/backend/alembic/env.py
@@ -10,7 +10,8 @@ from pathlib import Path
 sys.path.append(str(Path(__file__).resolve().parents[1]))
 
 # Import your models
-from app.schemas import tables
+from app.models.employee import Employee
+from app.models.request import Request
 from app.database import Base
 
 # this is the Alembic Config object
@@ -23,7 +24,7 @@ if config.config_file_name is not None:
 target_metadata = Base.metadata
 
 def get_url():
-    return os.getenv("DATABASE_URL", "postgresql://support_user:support_password@localhost:5432/support_db")
+    return os.getenv("DATABASE_URL", "postgresql://postgres:postgres123@postgres:5432/support_db")
 
 def run_migrations_offline() -> None:
     url = get_url()
@@ -49,7 +50,8 @@ def run_migrations_online() -> None:
     with connectable.connect() as connection:
         context.configure(
             connection=connection,
-            target_metadata=target_metadata
+            target_metadata=target_metadata,
+            compare_type=True
         )
 
         with context.begin_transaction():
diff --git a/backend/app/database.py b/backend/app/database.py
index b3284c7..d0e66ef 100644
--- a/backend/app/database.py
+++ b/backend/app/database.py
@@ -8,9 +8,14 @@ SQLALCHEMY_DATABASE_URL = os.getenv(
     "DATABASE_URL", "postgresql://postgres:postgres123@postgres:5432/support_db"
 )
 
-engine = create_engine(SQLALCHEMY_DATABASE_URL)
-SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    pool_pre_ping=True,
+    pool_size=5,
+    max_overflow=10
+)
 
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 Base = declarative_base()
 
 def get_db():
diff --git a/backend/app/models/__init__.py b/backend/app/models/__init__.py
index beb65c1..43f9894 100644
--- a/backend/app/models/__init__.py
+++ b/backend/app/models/__init__.py
@@ -1,7 +1,5 @@
 """Models initialization"""
-from ..database import Base, engine
 from .employee import Employee
 from .request import Request
 
-# Create all tables
-Base.metadata.create_all(bind=engine) 
\ No newline at end of file
+__all__ = ['Employee', 'Request'] 
\ No newline at end of file
diff --git a/backend/app/models/employee.py b/backend/app/models/employee.py
index 869757f..3d7959f 100644
--- a/backend/app/models/employee.py
+++ b/backend/app/models/employee.py
@@ -20,5 +20,6 @@ class Employee(Base):
     requests = relationship(
         "app.models.request.Request",
         back_populates="employee",
-        lazy="dynamic"
+        lazy="dynamic",
+        cascade="all, delete-orphan"
     )
\ No newline at end of file
diff --git a/backend/app/models/request.py b/backend/app/models/request.py
index 2a33887..891ab45 100644
--- a/backend/app/models/request.py
+++ b/backend/app/models/request.py
@@ -32,5 +32,6 @@ class Request(Base):
 
     employee = relationship(
         "app.models.employee.Employee",
-        back_populates="requests"
+        back_populates="requests",
+        lazy="joined"
     )