Add option to not create database tables

Author: Simon-Will

open_mastr/mastr.py

@@ -76,7 +76,9 @@ class Mastr:
 
     """
 
-    def __init__(self, engine="sqlite", connect_to_translated_db=False) -> None:
+    def __init__(
+        self, engine="sqlite", connect_to_translated_db=False, ensure_tables=True
+    ) -> None:
         validate_parameter_format_for_mastr_init(engine)
 
         self.output_dir = get_output_dir()
@@ -102,7 +104,8 @@ def __init__(self, engine="sqlite", connect_to_translated_db=False) -> None:
             "'pip install --upgrade open-mastr'\n"
         )
 
-        orm.Base.metadata.create_all(self.engine)
+        if ensure_tables:
+            orm.Base.metadata.create_all(self.engine)
 
     def download(
         self,