Add package type hints (#158)

* Add package type hints

* Add helper script to create schema

datastore/shared/postgresql_backend/create_schema.py

@@ -0,0 +1,17 @@
+import os
+
+from datastore.shared.di import injector
+from datastore.shared.postgresql_backend import ConnectionHandler
+
+
+def create_schema() -> None:
+    """
+    Helper function to write the database schema into the database.
+    """
+    connection_handler = injector.get(ConnectionHandler)
+    with connection_handler.get_connection_context():
+        with connection_handler.get_current_connection().cursor() as cursor:
+            path = os.path.realpath(
+                os.path.join(os.getcwd(), os.path.dirname(__file__), "schema.sql")
+            )
+            cursor.execute(open(path, "r").read(), [])

setup.py

@@ -13,6 +13,7 @@
     description="Package for OS4 to provide direct access to the datastore",
     packages=setuptools.find_packages(),
     install_requires=install_requires,
+    package_data={"datastore": ["py.typed", "shared/postgresql_backend/schema.sql"]},
     classifiers=[
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: MIT License",