Add new gin index to optimize ILIKE queries

lemur/migrations/versions/ee827d1e1974_.py

@@ -0,0 +1,35 @@
+"""Add pg_trgm indexes on certain attributes used for CN / Name filtering in ILIKE queries.
+
+Revision ID: ee827d1e1974
+Revises: 7ead443ba911
+Create Date: 2018-11-05 09:49:40.226368
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'ee827d1e1974'
+down_revision = '7ead443ba911'
+
+from alembic import op
+from sqlalchemy.exc import ProgrammingError
+
+def upgrade():
+    try:
+        connection = op.get_bind()
+        connection.execute("CREATE EXTENSION pg_trgm")
+    except ProgrammingError as e:
+        # Extension is most likely already enabled
+        connection.execute("ROLLBACK")
+
+    op.create_index('ix_certificates_cn', 'certificates', ['cn'], unique=False, postgresql_ops={'cn': 'gin_trgm_ops'},
+                    postgresql_using='gin')
+    op.create_index('ix_certificates_name', 'certificates', ['name'], unique=False,
+                    postgresql_ops={'name': 'gin_trgm_ops'}, postgresql_using='gin')
+    op.create_index('ix_domains_name_gin', 'domains', ['name'], unique=False, postgresql_ops={'name': 'gin_trgm_ops'},
+                    postgresql_using='gin')
+
+
+def downgrade():
+    op.drop_index('ix_domains_name', table_name='domains')
+    op.drop_index('ix_certificates_name', table_name='certificates')
+    op.drop_index('ix_certificates_cn', table_name='certificates')