added indexes on invoice ref table

pay-api/migrations/README.md

@@ -0,0 +1,7 @@
+## Migrating Pay-db
+
+Run `python manage.py db migrate`
+
+If you are updating a large table (i.e. invoices, invoice_references, etc.) add `op.execute("set statement_timeout=20000;")` to the top of your new migration scripts for upgrade/downgrade. This will prevent the deployment from causing errors in prod when it takes too long to complete (> 20 seconds).
+
+_Note: If it takes too long this will cause the prehook to fail in the deployment so you will need to watch it and redeploy at a less busy time if necessary_

pay-api/migrations/alembic.ini

@@ -3,7 +3,7 @@
 [alembic]
 script_location = .
 # template used to generate migration files
-# file_template = %%(rev)s_%%(slug)s
+file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(rev)s_%%(slug)s
 
 # set to 'true' to run the environment during
 # the 'revision' command, regardless of autogenerate

pay-api/migrations/versions/2023_02_08_inv_ref_indexes.py

@@ -0,0 +1,33 @@
+"""empty message
+
+Revision ID: e296910623cd
+Revises: 286acad5d366
+Create Date: 2023-02-07 12:17:04.806485
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from time import sleep
+
+
+# revision identifiers, used by Alembic.
+revision = 'e296910623cd'
+down_revision = '286acad5d366'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.execute("set statement_timeout=20000;")
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_index(op.f('ix_invoice_references_invoice_id'), 'invoice_references', ['invoice_id'], unique=False)
+    op.create_index(op.f('ix_invoice_references_status_code'), 'invoice_references', ['status_code'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    op.execute("set statement_timeout=20000;")
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_invoice_references_status_code'), table_name='invoice_references')
+    op.drop_index(op.f('ix_invoice_references_invoice_id'), table_name='invoice_references')
+    # ### end Alembic commands ###

pay-api/src/pay_api/models/invoice_reference.py

@@ -29,11 +29,12 @@ class InvoiceReference(BaseModel):  # pylint: disable=too-many-instance-attribut
     __tablename__ = 'invoice_references'
 
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
-    invoice_id = db.Column(db.Integer, ForeignKey('invoices.id'), nullable=False)
+    invoice_id = db.Column(db.Integer, ForeignKey('invoices.id'), nullable=False, index=True)
 
     invoice_number = db.Column(db.String(50), nullable=True, index=True)
     reference_number = db.Column(db.String(50), nullable=True)
-    status_code = db.Column(db.String(20), ForeignKey('invoice_reference_status_codes.code'), nullable=False)
+    status_code = db.Column(db.String(20), ForeignKey(
+        'invoice_reference_status_codes.code'), nullable=False, index=True)
 
     @classmethod
     def find_by_invoice_id_and_status(cls, invoice_id: int, status_code: str):