Dunitz/db setup (#1619)

* initial database setup

server/db/create_db.py

@@ -0,0 +1,18 @@
+"""
+Drops and recreates all tables for local testing according to cellxgene_orm.py
+"""
+from sqlalchemy import create_engine
+
+from server.db.cellxgene_orm import Base
+
+
+def create_db(database_uri: str = "postgresql://postgres:test_pw@localhost:5432"):
+    engine = create_engine(database_uri)
+    print("Dropping tables")
+    Base.metadata.drop_all(engine)
+    print("Recreating tables")
+    Base.metadata.create_all(engine)
+
+
+if __name__ == "__main__":
+    create_db()