Implement display artifacts, pricing integrity, draft base and publish preview bundle

backend/alembic/versions/20260319_12_create_scheme_artifacts.py

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+"""create scheme_artifacts
+
+Revision ID: 20260319_12
+Revises: 20260318_11
+Create Date: 2026-03-19 12:00:00
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "20260319_12"
+down_revision = "20260318_11"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "scheme_artifacts",
+        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
+        sa.Column("artifact_id", sa.String(length=32), nullable=False),
+        sa.Column("scheme_id", sa.String(length=32), nullable=False),
+        sa.Column("scheme_version_id", sa.String(length=32), nullable=False),
+        sa.Column("artifact_type", sa.String(length=64), nullable=False),
+        sa.Column("artifact_variant", sa.String(length=64), nullable=False),
+        sa.Column("storage_path", sa.Text(), nullable=False),
+        sa.Column("status", sa.String(length=32), nullable=False, server_default="ready"),
+        sa.Column("meta_json", sa.JSON(), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
+    )
+
+    op.create_index("ix_scheme_artifacts_artifact_id", "scheme_artifacts", ["artifact_id"], unique=True)
+    op.create_index("ix_scheme_artifacts_scheme_id", "scheme_artifacts", ["scheme_id"], unique=False)
+    op.create_index("ix_scheme_artifacts_scheme_version_id", "scheme_artifacts", ["scheme_version_id"], unique=False)
+    op.create_index("ix_scheme_artifacts_type_variant", "scheme_artifacts", ["scheme_version_id", "artifact_type", "artifact_variant"], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index("ix_scheme_artifacts_type_variant", table_name="scheme_artifacts")
+    op.drop_index("ix_scheme_artifacts_scheme_version_id", table_name="scheme_artifacts")
+    op.drop_index("ix_scheme_artifacts_scheme_id", table_name="scheme_artifacts")
+    op.drop_index("ix_scheme_artifacts_artifact_id", table_name="scheme_artifacts")
+    op.drop_table("scheme_artifacts")

backend/alembic/versions/20260319_13_price_rules_unique_target.py

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+"""price_rules unique target
+
+Revision ID: 20260319_13
+Revises: 20260319_12
+Create Date: 2026-03-19 12:40:00
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "20260319_13"
+down_revision = "20260319_12"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+
+    conn.execute(sa.text("""
+        delete from price_rules pr
+        using price_rules newer
+        where pr.scheme_id = newer.scheme_id
+          and pr.target_type = newer.target_type
+          and pr.target_ref = newer.target_ref
+          and pr.id < newer.id
+    """))
+
+    op.create_unique_constraint(
+        "uq_price_rules_scheme_target",
+        "price_rules",
+        ["scheme_id", "target_type", "target_ref"],
+    )
+
+
+def downgrade() -> None:
+    op.drop_constraint("uq_price_rules_scheme_target", "price_rules", type_="unique")

backend/alembic/versions/20260319_14_scheme_version_pricing_snapshot.py

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+"""scheme version pricing snapshot
+
+Revision ID: 20260319_14
+Revises: 20260319_13
+Create Date: 2026-03-19 13:40:00
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "20260319_14"
+down_revision = "20260319_13"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "scheme_version_pricing_categories",
+        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
+        sa.Column("snapshot_category_id", sa.String(length=32), nullable=False),
+        sa.Column("scheme_id", sa.String(length=32), nullable=False),
+        sa.Column("scheme_version_id", sa.String(length=32), nullable=False),
+        sa.Column("source_pricing_category_id", sa.String(length=32), nullable=True),
+        sa.Column("name", sa.String(length=255), nullable=False),
+        sa.Column("code", sa.String(length=128), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
+    )
+    op.create_index(
+        "ix_scheme_version_pricing_categories_snapshot_category_id",
+        "scheme_version_pricing_categories",
+        ["snapshot_category_id"],
+        unique=True,
+    )
+    op.create_index(
+        "ix_scheme_version_pricing_categories_scheme_version_id",
+        "scheme_version_pricing_categories",
+        ["scheme_version_id"],
+        unique=False,
+    )
+
+    op.create_table(
+        "scheme_version_price_rules",
+        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
+        sa.Column("snapshot_price_rule_id", sa.String(length=32), nullable=False),
+        sa.Column("scheme_id", sa.String(length=32), nullable=False),
+        sa.Column("scheme_version_id", sa.String(length=32), nullable=False),
+        sa.Column("source_price_rule_id", sa.String(length=32), nullable=True),
+        sa.Column("snapshot_category_id", sa.String(length=32), nullable=True),
+        sa.Column("target_type", sa.String(length=32), nullable=False),
+        sa.Column("target_ref", sa.String(length=128), nullable=False),
+        sa.Column("amount", sa.Numeric(12, 2), nullable=False),
+        sa.Column("currency", sa.String(length=8), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
+    )
+    op.create_index(
+        "ix_scheme_version_price_rules_snapshot_price_rule_id",
+        "scheme_version_price_rules",
+        ["snapshot_price_rule_id"],
+        unique=True,
+    )
+    op.create_index(
+        "ix_scheme_version_price_rules_scheme_version_id",
+        "scheme_version_price_rules",
+        ["scheme_version_id"],
+        unique=False,
+    )
+    op.create_index(
+        "ix_scheme_version_price_rules_lookup",
+        "scheme_version_price_rules",
+        ["scheme_version_id", "target_type", "target_ref"],
+        unique=False,
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_scheme_version_price_rules_lookup", table_name="scheme_version_price_rules")
+    op.drop_index("ix_scheme_version_price_rules_scheme_version_id", table_name="scheme_version_price_rules")
+    op.drop_index("ix_scheme_version_price_rules_snapshot_price_rule_id", table_name="scheme_version_price_rules")
+    op.drop_table("scheme_version_price_rules")
+
+    op.drop_index("ix_scheme_version_pricing_categories_scheme_version_id", table_name="scheme_version_pricing_categories")
+    op.drop_index("ix_scheme_version_pricing_categories_snapshot_category_id", table_name="scheme_version_pricing_categories")
+    op.drop_table("scheme_version_pricing_categories")