First commit

migrations/versions/phase26_issue_vendor.py

@@ -0,0 +1,50 @@
+"""phase26 — vendor/contractor columns on issues
+
+Adds three nullable columns to the issues table:
+  vendor_name    VARCHAR(100) — name of the external contractor or vendor
+  vendor_contact VARCHAR(200) — phone number or email for the vendor
+  vendor_notes   TEXT         — notes about what the vendor is handling
+
+These columns are populated only when a third-party contractor is
+assigned to resolve an issue, separate from the internal assigned_to staff user.
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision      = 'phase26_issue_vendor'
+down_revision = 'phase25_inspection_gps'
+branch_labels = None
+depends_on    = None
+
+
+def _col_exists(bind, table: str, column: str) -> bool:
+    result = bind.execute(sa.text(
+        "SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS "
+        "WHERE TABLE_SCHEMA = DATABASE() "
+        "  AND TABLE_NAME  = :t "
+        "  AND COLUMN_NAME = :c"
+    ), {'t': table, 'c': column})
+    return result.scalar() > 0
+
+
+def upgrade():
+    bind = op.get_bind()
+
+    if not _col_exists(bind, 'issues', 'vendor_name'):
+        op.add_column('issues',
+            sa.Column('vendor_name', sa.String(100), nullable=True))
+
+    if not _col_exists(bind, 'issues', 'vendor_contact'):
+        op.add_column('issues',
+            sa.Column('vendor_contact', sa.String(200), nullable=True))
+
+    if not _col_exists(bind, 'issues', 'vendor_notes'):
+        op.add_column('issues',
+            sa.Column('vendor_notes', sa.Text, nullable=True))
+
+
+def downgrade():
+    op.drop_column('issues', 'vendor_notes')
+    op.drop_column('issues', 'vendor_contact')
+    op.drop_column('issues', 'vendor_name')