US01-05: Generate and Serve Managed Thumbnails (#50)

migrations/versions/0003_thumbnails.py

@@ -0,0 +1,46 @@
+"""Managed thumbnail cache table.
+
+Revision ID: 0003_thumbnails
+Revises: 0002_duplicate_engine
+Create Date: 2026-07-15
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "0003_thumbnails"
+down_revision = "0002_duplicate_engine"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "thumbnails",
+        sa.Column("cache_key", sa.String(), primary_key=True),
+        sa.Column("asset_id", sa.String(), sa.ForeignKey("assets.id"), nullable=False),
+        sa.Column("size", sa.Integer(), nullable=False),
+        sa.Column("state", sa.String(), nullable=False),
+        sa.Column("error_code", sa.String(), nullable=True),
+        sa.Column("path", sa.String(), nullable=True),
+        sa.Column("width", sa.Integer(), nullable=True),
+        sa.Column("height", sa.Integer(), nullable=True),
+        sa.Column("format", sa.String(), nullable=True),
+        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_thumbnails_asset_id", "thumbnails", ["asset_id"])
+
+
+def downgrade() -> None:
+    op.drop_table("thumbnails")