Copilot claude task no tuning

.python-version

@@ -0,0 +1 @@
+3.12

TASK.md

@@ -0,0 +1,24 @@
+# Backend task for implementation
+
+Create a backend endpoints which implements following functionality:
+
+- Introduce a new entity Wallet and Transaction.
+- Wallet should have fields: id, user_id (foreign key to User), balance (float), currency (string).
+- Available currencies: USD, EUR, RUB.
+- Transaction should have fields: id, wallet_id (foreign key to Wallet), amount (float), type (enum: 'credit', 'debit'), timestamp (datetime), currency (string).
+- Implement endpoint to create a wallet for a user.
+- Implement endpoint to get wallet details including current balance.
+- Implement endpoint to create a transaction (credit or debit) for a wallet.
+
+# Rules for wallet
+
+- A user can have three wallets.
+- Wallet balance should start at 0.0.
+- Arithmetic operations on balance should be precise up to two decimal places.
+
+# Rules for transaction
+
+- For 'credit' transactions, the amount should be added to the wallet balance.
+- For 'debit' transactions, the amount should be subtracted from the wallet balance.
+- Ensure that the wallet balance cannot go negative. If a debit transaction would cause the balance to go negative, the transaction should be rejected with an appropriate error message.
+- Transaction between wallets with different currencies must be converted using a fixed exchange rate (you can hardcode some exchange rates for simplicity) and fees should be applied.

backend/app/alembic/env.py

@@ -1,39 +1,31 @@
-import os
+"""Alembic configuration for database migrations."""
+
 from logging.config import fileConfig
 
 from alembic import context
 from sqlalchemy import engine_from_config, pool
+from sqlmodel import SQLModel
+
+from app.core.config import settings
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
 config = context.config
 
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
-fileConfig(config.config_file_name)
-
-# add your model's MetaData object here
-# for 'autogenerate' support
-# from myapp import mymodel
-# target_metadata = mymodel.Base.metadata
-# target_metadata = None
-
-from app.models import SQLModel  # noqa
-from app.core.config import settings # noqa
+if config.config_file_name:
+    fileConfig(config.config_file_name)
 
 target_metadata = SQLModel.metadata
 
-# other values from the config, defined by the needs of env.py,
-# can be acquired:
-# my_important_option = config.get_main_option("my_important_option")
-# ... etc.
-
 
-def get_url():
+def get_url() -> str:
+    """Get database URL from settings."""
     return str(settings.SQLALCHEMY_DATABASE_URI)
 
 
-def run_migrations_offline():
+def run_migrations_offline() -> None:
     """Run migrations in 'offline' mode.
 
     This configures the context with just a URL
@@ -47,21 +39,24 @@ def run_migrations_offline():
     """
     url = get_url()
     context.configure(
-        url=url, target_metadata=target_metadata, literal_binds=True, compare_type=True
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        compare_type=True,
     )
 
     with context.begin_transaction():
         context.run_migrations()
 
 
-def run_migrations_online():
+def run_migrations_online() -> None:
     """Run migrations in 'online' mode.
 
     In this scenario we need to create an Engine
     and associate a connection with the context.
 
     """
-    configuration = config.get_section(config.config_ini_section)
+    configuration = config.get_section(config.config_ini_section) or {}
     configuration["sqlalchemy.url"] = get_url()
     connectable = engine_from_config(
         configuration,
@@ -71,7 +66,9 @@ def run_migrations_online():
 
     with connectable.connect() as connection:
         context.configure(
-            connection=connection, target_metadata=target_metadata, compare_type=True
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,
         )
 
         with context.begin_transaction():

backend/app/alembic/versions/1a31ce608336_add_cascade_delete_relationships.py

@@ -1,37 +1,52 @@
-"""Add cascade delete relationships
+"""Add cascade delete relationships.
 
 Revision ID: 1a31ce608336
 Revises: d98dd8ec85a3
 Create Date: 2024-07-31 22:24:34.447891
 
 """
-from alembic import op
-import sqlalchemy as sa
-import sqlmodel.sql.sqltypes
 
+import sqlalchemy as sa
+from alembic import op
 
 # revision identifiers, used by Alembic.
-revision = '1a31ce608336'
-down_revision = 'd98dd8ec85a3'
-branch_labels = None
-depends_on = None
+revision = "1a31ce608336"
+down_revision = "d98dd8ec85a3"
+branch_labels: str | None = None
+depends_on: str | None = None
 
 
-def upgrade():
+def upgrade() -> None:
+    """Upgrade database schema."""
     # ### commands auto generated by Alembic - please adjust! ###
-    op.alter_column('item', 'owner_id',
-               existing_type=sa.UUID(),
-               nullable=False)
-    op.drop_constraint('item_owner_id_fkey', 'item', type_='foreignkey')
-    op.create_foreign_key(None, 'item', 'user', ['owner_id'], ['id'], ondelete='CASCADE')
+    op.alter_column(
+        "item",
+        "owner_id",
+        existing_type=sa.UUID(),
+        nullable=False,
+    )
+    op.drop_constraint("item_owner_id_fkey", "item", type_="foreignkey")
+    op.create_foreign_key(
+        None,
+        "item",
+        "user",
+        ["owner_id"],
+        ["id"],
+        ondelete="CASCADE",
+    )
     # ### end Alembic commands ###
 
 
-def downgrade():
+def downgrade() -> None:
+    """Downgrade database schema."""
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_constraint(None, 'item', type_='foreignkey')
-    op.create_foreign_key('item_owner_id_fkey', 'item', 'user', ['owner_id'], ['id'])
-    op.alter_column('item', 'owner_id',
-               existing_type=sa.UUID(),
-               nullable=True)
+    op.drop_constraint("item_owner_id_fkey", "item", type_="foreignkey")
+    op.create_foreign_key(
+        "item_owner_id_fkey",
+        "item",
+        "user",
+        ["owner_id"],
+        ["id"],
+    )
+    op.alter_column("item", "owner_id", existing_type=sa.UUID(), nullable=True)
     # ### end Alembic commands ###

backend/app/alembic/versions/9c0a54914c78_add_max_length_for_string_varchar_.py

@@ -1,69 +1,99 @@
-"""Add max length for string(varchar) fields in User and Items models
+"""Add max length for string(varchar) fields in User and Items models.
 
 Revision ID: 9c0a54914c78
 Revises: e2412789c190
 Create Date: 2024-06-17 14:42:44.639457
 
 """
-from alembic import op
+
 import sqlalchemy as sa
-import sqlmodel.sql.sqltypes
+from alembic import op
 
+# Constants
+STRING_FIELD_LENGTH = 255
+USER_TABLE = "user"
+ITEM_TABLE = "item"
 
 # revision identifiers, used by Alembic.
-revision = '9c0a54914c78'
-down_revision = 'e2412789c190'
-branch_labels = None
-depends_on = None
+revision = "9c0a54914c78"
+down_revision = "e2412789c190"
+branch_labels: str | None = None
+depends_on: str | None = None
 
 
-def upgrade():
+def upgrade() -> None:
+    """Upgrade database schema."""
     # Adjust the length of the email field in the User table
-    op.alter_column('user', 'email',
-               existing_type=sa.String(),
-               type_=sa.String(length=255),
-               existing_nullable=False)
+    op.alter_column(
+        USER_TABLE,
+        "email",
+        existing_type=sa.String(),
+        type_=sa.String(length=STRING_FIELD_LENGTH),
+        existing_nullable=False,
+    )
 
     # Adjust the length of the full_name field in the User table
-    op.alter_column('user', 'full_name',
-               existing_type=sa.String(),
-               type_=sa.String(length=255),
-               existing_nullable=True)
+    op.alter_column(
+        USER_TABLE,
+        "full_name",
+        existing_type=sa.String(),
+        type_=sa.String(length=STRING_FIELD_LENGTH),
+        existing_nullable=True,
+    )
 
     # Adjust the length of the title field in the Item table
-    op.alter_column('item', 'title',
-               existing_type=sa.String(),
-               type_=sa.String(length=255),
-               existing_nullable=False)
+    op.alter_column(
+        ITEM_TABLE,
+        "title",
+        existing_type=sa.String(),
+        type_=sa.String(length=STRING_FIELD_LENGTH),
+        existing_nullable=False,
+    )
 
     # Adjust the length of the description field in the Item table
-    op.alter_column('item', 'description',
-               existing_type=sa.String(),
-               type_=sa.String(length=255),
-               existing_nullable=True)
+    op.alter_column(
+        ITEM_TABLE,
+        "description",
+        existing_type=sa.String(),
+        type_=sa.String(length=STRING_FIELD_LENGTH),
+        existing_nullable=True,
+    )
 
 
-def downgrade():
+def downgrade() -> None:
+    """Downgrade database schema."""
     # Revert the length of the email field in the User table
-    op.alter_column('user', 'email',
-               existing_type=sa.String(length=255),
-               type_=sa.String(),
-               existing_nullable=False)
+    op.alter_column(
+        USER_TABLE,
+        "email",
+        existing_type=sa.String(length=STRING_FIELD_LENGTH),
+        type_=sa.String(),
+        existing_nullable=False,
+    )
 
     # Revert the length of the full_name field in the User table
-    op.alter_column('user', 'full_name',
-               existing_type=sa.String(length=255),
-               type_=sa.String(),
-               existing_nullable=True)
+    op.alter_column(
+        USER_TABLE,
+        "full_name",
+        existing_type=sa.String(length=STRING_FIELD_LENGTH),
+        type_=sa.String(),
+        existing_nullable=True,
+    )
 
     # Revert the length of the title field in the Item table
-    op.alter_column('item', 'title',
-               existing_type=sa.String(length=255),
-               type_=sa.String(),
-               existing_nullable=False)
+    op.alter_column(
+        ITEM_TABLE,
+        "title",
+        existing_type=sa.String(length=STRING_FIELD_LENGTH),
+        type_=sa.String(),
+        existing_nullable=False,
+    )
 
     # Revert the length of the description field in the Item table
-    op.alter_column('item', 'description',
-               existing_type=sa.String(length=255),
-               type_=sa.String(),
-               existing_nullable=True)
+    op.alter_column(
+        ITEM_TABLE,
+        "description",
+        existing_type=sa.String(length=STRING_FIELD_LENGTH),
+        type_=sa.String(),
+        existing_nullable=True,
+    )