feat: add campaign model and API integration with price and tags

alembic/versions/0003_campaign_display_fields.py

@@ -0,0 +1,53 @@
+"""Add campaign display fields.
+
+Revision ID: 0003_campaign_display_fields
+Revises: 0002_add_map_image
+Create Date: 2026-07-02
+"""
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+from sqlalchemy.dialects import postgresql
+
+
+revision = "0003_campaign_display_fields"
+down_revision = "0002_add_map_image"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    if "Campaign" not in set(inspect(bind).get_table_names()):
+        return
+
+    columns = {column["name"] for column in inspect(bind).get_columns("Campaign")}
+    if "priceAmount" not in columns:
+        op.add_column("Campaign", sa.Column("priceAmount", sa.Integer(), nullable=True))
+    if "priceUnit" not in columns:
+        op.add_column("Campaign", sa.Column("priceUnit", sa.String(), nullable=True))
+    if "tags" not in columns:
+        op.add_column(
+            "Campaign",
+            sa.Column(
+                "tags",
+                postgresql.ARRAY(sa.String()),
+                nullable=False,
+                server_default=sa.text("'{}'::varchar[]"),
+            ),
+        )
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    if "Campaign" not in set(inspect(bind).get_table_names()):
+        return
+
+    columns = {column["name"] for column in inspect(bind).get_columns("Campaign")}
+    if "tags" in columns:
+        op.drop_column("Campaign", "tags")
+    if "priceUnit" in columns:
+        op.drop_column("Campaign", "priceUnit")
+    if "priceAmount" in columns:
+        op.drop_column("Campaign", "priceAmount")