add drugs db index

alembic/versions/2025_08_07_2030-058739dc7aa6_add_drug_index.py

@@ -0,0 +1,36 @@
+"""add drug index
+
+Revision ID: 058739dc7aa6
+Revises: c509dcf806d4
+Create Date: 2025-08-07 20:30:35.962671
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '058739dc7aa6'
+down_revision: Union[str, Sequence[str], None] = 'c509dcf806d4'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('drugs', schema=None) as batch_op:
+        batch_op.create_index('ix_drugs_name_dosage_dosage_unit', ['name', 'dosage', 'dosage_unit'], unique=True)
+
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('drugs', schema=None) as batch_op:
+        batch_op.drop_index('ix_drugs_name_dosage_dosage_unit')
+
+    # ### end Alembic commands ###