Scaffold SQLAlchemy models, routers, and Alembic migrations
- app/models/: Printer, Filament, PrintJob, Todo, PricingConfig with full SQLAlchemy 2.x mapped columns and relationships - app/routers/: list + get-by-id endpoints for all five resources - app/db.py: SQLAlchemy engine + SessionLocal + get_db dependency - alembic/: env.py reads MYSQL_* env vars; 0001_initial_schema mirrors db.sql - alembic.ini: script_location configured, URL injected at runtime Since db.sql already created the tables, stamp the DB before running future migrations: alembic stamp head Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Martin Hohenberg
54
alembic/env.py
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54
alembic/env.py
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import os
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from logging.config import fileConfig
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from sqlalchemy import engine_from_config, pool
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from alembic import context
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config = context.config
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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from app.models.base import Base
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import app.models # noqa: F401 — registers all models with Base.metadata
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target_metadata = Base.metadata
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def get_url() -> str:
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return (
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f"mysql+pymysql://{os.environ['MYSQL_USER']}:{os.environ['MYSQL_PASSWORD']}"
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f"@{os.environ['MYSQL_HOST']}:{os.environ.get('MYSQL_PORT', 3306)}"
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f"/{os.environ['MYSQL_DATABASE']}"
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)
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def run_migrations_offline() -> None:
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context.configure(
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url=get_url(),
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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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() -> None:
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config.set_main_option("sqlalchemy.url", get_url())
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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context.configure(connection=connection, target_metadata=target_metadata)
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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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25
alembic/script.py.mako
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25
alembic/script.py.mako
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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: ${create_date}
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"""
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from typing import Sequence, Union
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from alembic import op
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import sqlalchemy as sa
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${imports if imports else ""}
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revision: str = ${repr(up_revision)}
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down_revision: Union[str, None] = ${repr(down_revision)}
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branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
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depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
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def upgrade() -> None:
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${upgrades if upgrades else "pass"}
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def downgrade() -> None:
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${downgrades if downgrades else "pass"}
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112
alembic/versions/0001_initial_schema.py
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112
alembic/versions/0001_initial_schema.py
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"""initial schema
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Revision ID: 0001
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Revises:
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Create Date: 2026-06-18
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"""
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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from sqlalchemy.dialects import mysql
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revision: str = "0001"
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down_revision: Union[str, None] = None
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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def upgrade() -> None:
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op.create_table(
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"printers",
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sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
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sa.Column("name", sa.String(length=100), nullable=False),
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sa.Column("model", sa.String(length=100), nullable=True),
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sa.Column("location", sa.String(length=100), nullable=True),
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sa.Column(
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"status",
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mysql.ENUM("idle", "printing", "error", "offline"),
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nullable=False,
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server_default="offline",
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),
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sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
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sa.Column("updated_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_table(
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"filaments",
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sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
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sa.Column("brand", sa.String(length=100), nullable=True),
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sa.Column(
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"material",
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mysql.ENUM("PLA", "PETG", "ABS", "ASA", "TPU", "Nylon", "PC", "Other"),
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nullable=False,
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server_default="PLA",
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),
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sa.Column("color", sa.String(length=100), nullable=True),
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sa.Column("color_hex", sa.String(length=7), nullable=True),
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sa.Column("weight_total_g", sa.Numeric(precision=8, scale=2), nullable=False),
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sa.Column("weight_remaining_g", sa.Numeric(precision=8, scale=2), nullable=False),
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sa.Column("price_per_kg_eur", sa.Numeric(precision=8, scale=2), nullable=True),
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sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
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sa.Column("updated_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_table(
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"pricing_config",
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sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
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sa.Column("name", sa.String(length=100), nullable=False, server_default="default"),
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sa.Column("electricity_kwh_eur", sa.Numeric(precision=6, scale=4), nullable=False, server_default="0.3000"),
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sa.Column("printer_watt", sa.Numeric(precision=8, scale=2), nullable=False, server_default="200.00"),
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sa.Column("hourly_rate_eur", sa.Numeric(precision=8, scale=2), nullable=False, server_default="0.00"),
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sa.Column("markup_percent", sa.Numeric(precision=5, scale=2), nullable=False, server_default="20.00"),
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sa.Column("valid_from", sa.Date(), nullable=False, server_default=sa.text("(CURRENT_DATE)")),
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sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_table(
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"todos",
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sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
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sa.Column("title", sa.String(length=255), nullable=False),
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sa.Column("done", sa.Boolean(), nullable=False, server_default="0"),
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sa.Column("printer_id", sa.Integer(), nullable=True),
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sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
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sa.Column("updated_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")),
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sa.ForeignKeyConstraint(["printer_id"], ["printers.id"], name="fk_todo_printer"),
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sa.PrimaryKeyConstraint("id"),
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)
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op.create_table(
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"print_jobs",
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sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
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sa.Column("printer_id", sa.Integer(), nullable=False),
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sa.Column("filament_id", sa.Integer(), nullable=True),
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sa.Column("name", sa.String(length=200), nullable=False),
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sa.Column("file_name", sa.String(length=255), nullable=True),
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sa.Column(
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"status",
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mysql.ENUM("queued", "printing", "done", "failed", "cancelled"),
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nullable=False,
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server_default="queued",
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),
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sa.Column("queue_position", sa.Integer(), nullable=True),
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sa.Column("started_at", sa.DateTime(), nullable=True),
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sa.Column("finished_at", sa.DateTime(), nullable=True),
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sa.Column("duration_minutes", sa.Integer(), nullable=True),
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sa.Column("filament_used_g", sa.Numeric(precision=8, scale=2), nullable=True),
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sa.Column("cost_eur", sa.Numeric(precision=8, scale=2), nullable=True),
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sa.Column("notes", sa.Text(), nullable=True),
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sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
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sa.Column("updated_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")),
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sa.ForeignKeyConstraint(["filament_id"], ["filaments.id"], name="fk_job_filament"),
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sa.ForeignKeyConstraint(["printer_id"], ["printers.id"], name="fk_job_printer"),
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sa.PrimaryKeyConstraint("id"),
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)
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def downgrade() -> None:
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op.drop_table("print_jobs")
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op.drop_table("todos")
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op.drop_table("pricing_config")
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op.drop_table("filaments")
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op.drop_table("printers")
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