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Single-database configuration for Flask.
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# A generic, single database configuration.
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[alembic]
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# template used to generate migration files
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# file_template = %%(rev)s_%%(slug)s
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# set to 'true' to run the environment during
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# the 'revision' command, regardless of autogenerate
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# revision_environment = false
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# Logging configuration
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[loggers]
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keys = root,sqlalchemy,alembic,flask_migrate
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[handlers]
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keys = console
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[formatters]
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keys = generic
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[logger_root]
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level = WARN
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handlers = console
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qualname =
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[logger_sqlalchemy]
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level = WARN
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handlers =
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qualname = sqlalchemy.engine
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[logger_alembic]
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level = INFO
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handlers =
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qualname = alembic
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[logger_flask_migrate]
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level = INFO
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handlers =
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qualname = flask_migrate
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[handler_console]
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class = StreamHandler
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args = (sys.stderr,)
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level = NOTSET
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formatter = generic
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[formatter_generic]
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format = %(levelname)-5.5s [%(name)s] %(message)s
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datefmt = %H:%M:%S
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import logging
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from logging.config import fileConfig
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from flask import current_app
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from alembic import context
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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fileConfig(config.config_file_name)
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logger = logging.getLogger('alembic.env')
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def get_engine():
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try:
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# this works with Flask-SQLAlchemy<3 and Alchemical
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return current_app.extensions['migrate'].db.get_engine()
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except (TypeError, AttributeError):
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# this works with Flask-SQLAlchemy>=3
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return current_app.extensions['migrate'].db.engine
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def get_engine_url():
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try:
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return get_engine().url.render_as_string(hide_password=False).replace(
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'%', '%%')
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except AttributeError:
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return str(get_engine().url).replace('%', '%%')
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# add your model's MetaData object here
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# for 'autogenerate' support
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# from myapp import mymodel
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# target_metadata = mymodel.Base.metadata
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config.set_main_option('sqlalchemy.url', get_engine_url())
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target_db = current_app.extensions['migrate'].db
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# other values from the config, defined by the needs of env.py,
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# can be acquired:
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# my_important_option = config.get_main_option("my_important_option")
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# ... etc.
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def get_metadata():
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if hasattr(target_db, 'metadatas'):
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return target_db.metadatas[None]
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return target_db.metadata
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def run_migrations_offline():
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url, target_metadata=get_metadata(), literal_binds=True
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online():
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"""Run migrations in 'online' mode.
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In this scenario we need to create an Engine
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and associate a connection with the context.
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"""
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# this callback is used to prevent an auto-migration from being generated
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# when there are no changes to the schema
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# reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
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def process_revision_directives(context, revision, directives):
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if getattr(config.cmd_opts, 'autogenerate', False):
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script = directives[0]
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if script.upgrade_ops.is_empty():
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directives[:] = []
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logger.info('No changes in schema detected.')
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conf_args = current_app.extensions['migrate'].configure_args
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if conf_args.get("process_revision_directives") is None:
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conf_args["process_revision_directives"] = process_revision_directives
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connectable = get_engine()
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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=get_metadata(),
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**conf_args
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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"""${message}
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Revision ID: ${up_revision}
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Revises: ${down_revision | comma,n}
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Create Date: ${create_date}
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"""
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from alembic import op
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import sqlalchemy as sa
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${imports if imports else ""}
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# revision identifiers, used by Alembic.
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revision = ${repr(up_revision)}
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down_revision = ${repr(down_revision)}
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branch_labels = ${repr(branch_labels)}
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depends_on = ${repr(depends_on)}
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def upgrade():
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${upgrades if upgrades else "pass"}
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def downgrade():
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${downgrades if downgrades else "pass"}
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"""empty message
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Revision ID: 43a744ce1b04
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Revises:
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Create Date: 2024-06-28 16:58:21.904222
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"""
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from alembic import op
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import sqlalchemy as sa
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# revision identifiers, used by Alembic.
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revision = '43a744ce1b04'
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down_revision = None
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branch_labels = None
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depends_on = None
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def upgrade():
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# ### commands auto generated by Alembic - please adjust! ###
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op.create_table('people',
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sa.Column('uid', sa.Integer(), nullable=False),
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sa.Column('name', sa.String(), nullable=False),
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sa.Column('job', sa.String(), nullable=True),
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sa.Column('age', sa.Integer(), nullable=True),
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sa.PrimaryKeyConstraint('uid')
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)
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op.create_table('todos',
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sa.Column('tid', sa.Integer(), nullable=False),
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sa.Column('title', sa.String(), nullable=False),
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sa.Column('done', sa.Boolean(), nullable=False),
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sa.Column('description', sa.String(), nullable=True),
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sa.PrimaryKeyConstraint('tid')
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)
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# ### end Alembic commands ###
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def downgrade():
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# ### commands auto generated by Alembic - please adjust! ###
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op.drop_table('todos')
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op.drop_table('people')
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# ### end Alembic commands ###
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alembic==1.13.2
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bcrypt==4.1.3
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blinker==1.8.2
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click==8.1.7
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et-xmlfile==1.1.0
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Flask==3.0.3
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Flask-Bcrypt==1.0.1
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Flask-Login==0.6.3
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Flask-Migrate==4.0.7
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Flask-SQLAlchemy==3.1.1
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greenlet==3.0.3
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itsdangerous==2.2.0
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Jinja2==3.1.4
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Mako==1.3.5
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MarkupSafe==2.1.5
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numpy==2.0.0
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openpyxl==3.1.4
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pandas==2.2.2
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python-dateutil==2.9.0.post0
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pytz==2024.1
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six==1.16.0
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SQLAlchemy==2.0.31
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typing_extensions==4.12.2
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tzdata==2024.1
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Werkzeug==3.0.3
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Reference in new issue