Интеграция базы данных Postgresql v2

backend/alembic.ini

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+[alembic]
+script_location = alembic
+sqlalchemy.url = postgresql://support_user:support_password@localhost:5432/support_db
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

backend/alembic/env.py

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+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import os
+import sys
+from pathlib import Path
+
+# Add the parent directory to sys.path
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+# Import your models
+from app.schemas import tables
+from app.database import Base
+
+# this is the Alembic Config object
+config = context.config
+
+# Interpret the config file for Python logging
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+def get_url():
+    return os.getenv("DATABASE_URL", "postgresql://support_user:support_password@localhost:5432/support_db")
+
+def run_migrations_offline() -> None:
+    url = get_url()
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+def run_migrations_online() -> None:
+    configuration = config.get_section(config.config_ini_section)
+    configuration["sqlalchemy.url"] = get_url()
+    connectable = engine_from_config(
+        configuration,
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/versions/initial_migration.py

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+"""Initial migration
+
+Revision ID: initial_migration
+Create Date: 2024-03-14 12:00:00.000000
+"""
+from alembic import op
+import sqlalchemy as sa
+from app.models.request import RequestStatus, RequestPriority
+
+# revision identifiers, used by Alembic.
+revision = 'initial_migration'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+def upgrade() -> None:
+    # Create employees table
+    op.create_table(
+        'employees',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('first_name', sa.String(), nullable=False),
+        sa.Column('last_name', sa.String(), nullable=False),
+        sa.Column('department', sa.String(), nullable=False),
+        sa.Column('office', sa.String(), nullable=False),
+        sa.Column('password', sa.String(), nullable=False),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()')),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_employees_id'), 'employees', ['id'], unique=False)
+    op.create_index(op.f('ix_employees_last_name'), 'employees', ['last_name'], unique=False)
+
+    # Create requests table
+    op.create_table(
+        'requests',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('employee_id', sa.Integer(), nullable=True),
+        sa.Column('department', sa.String(), nullable=False),
+        sa.Column('request_type', sa.String(), nullable=False),
+        sa.Column('priority', sa.Enum(RequestPriority), nullable=False),
+        sa.Column('status', sa.Enum(RequestStatus), nullable=False, server_default='new'),
+        sa.Column('description', sa.String(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()')),
+        sa.ForeignKeyConstraint(['employee_id'], ['employees.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_requests_id'), 'requests', ['id'], unique=False)
+
+def downgrade() -> None:
+    op.drop_table('requests')
+    op.drop_table('employees')