US01-02: Establish Application and Database Foundation (#47)

migrations/env.py

@@ -0,0 +1,50 @@
+"""Alembic environment.
+
+The database URL is injected by photo_pipeline.db.run_migrations. Importing the
+models package registers every table on Base.metadata for autogenerate. Logging
+config is owned by the application, so fileConfig is intentionally not called.
+"""
+
+from __future__ import annotations
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+import photo_pipeline.models  # noqa: F401  (registers models on Base.metadata)
+from photo_pipeline.db import Base
+
+config = context.config
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=config.get_main_option("sqlalchemy.url"),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        render_as_batch=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=True,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

@@ -0,0 +1,22 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

migrations/versions/0001_initial_identity.py

@@ -0,0 +1,70 @@
+"""Initial stable-identity schema: assets and asset_paths.
+
+Revision ID: 0001_initial_identity
+Revises:
+Create Date: 2026-07-15
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "0001_initial_identity"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "assets",
+        sa.Column("id", sa.String(), primary_key=True),
+        sa.Column("original_path", sa.String(), nullable=False),
+        sa.Column("current_path", sa.String(), nullable=True, unique=True),
+        sa.Column("current_sha256", sa.String(), nullable=True),
+        sa.Column("pixel_sha256", sa.String(), nullable=True),
+        sa.Column("phash", sa.String(), nullable=True),
+        sa.Column("hash_version", sa.Integer(), nullable=False, server_default="1"),
+        sa.Column("byte_size", sa.Integer(), nullable=True),
+        sa.Column("discovered_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("missing_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column(
+            "availability_state", sa.String(), nullable=False, server_default="active"
+        ),
+        sa.Column("state_version", sa.Integer(), nullable=False, server_default="1"),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.text("CURRENT_TIMESTAMP"),
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.text("CURRENT_TIMESTAMP"),
+        ),
+    )
+    op.create_index("ix_assets_current_sha256", "assets", ["current_sha256"])
+    op.create_index("ix_assets_pixel_sha256", "assets", ["pixel_sha256"])
+    op.create_index("ix_assets_phash", "assets", ["phash"])
+    op.create_index("ix_assets_availability_state", "assets", ["availability_state"])
+
+    op.create_table(
+        "asset_paths",
+        sa.Column(
+            "asset_id",
+            sa.String(),
+            sa.ForeignKey("assets.id"),
+            primary_key=True,
+        ),
+        sa.Column("path", sa.String(), primary_key=True),
+        sa.Column("valid_from", sa.DateTime(timezone=True), primary_key=True),
+        sa.Column("valid_until", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("reason", sa.String(), nullable=True),
+    )
+    op.create_index("ix_asset_paths_path", "asset_paths", ["path"])
+
+
+def downgrade() -> None:
+    op.drop_table("asset_paths")
+    op.drop_table("assets")