Drop codename stuff

Applications should implement their own "database codename" if
they require such.

CHANGELOG.md

@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Removed
 
+- The ``codename`` field and related stuff has been removed from ``DatabaseMapping``.
+
 ### Fixed
 
 ### Security

spinedb_api/db_mapping.py

@@ -18,10 +18,8 @@
 
 from datetime import datetime, timezone
 from functools import partialmethod
-import hashlib
 import logging
 import os
-import time
 from types import MethodType
 from alembic.config import Config
 from alembic.environment import EnvironmentContext
@@ -142,7 +140,6 @@ def __init__(
             upgrade (bool, optional): Whether the DB at the given `url` should be upgraded to the most recent
                 version.
             backup_url (str, optional): A URL to backup the DB before upgrading.
-            codename (str, optional): A name to identify this object in your application.
             create (bool, optional): Whether to create a new Spine DB at the given `url` if it's not already one.
             apply_filters (bool, optional): Whether to apply filters in the `url`'s query segment.
             memory (bool, optional): Whether to use a SQLite memory DB as replacement for the original one.
@@ -209,20 +206,6 @@ def _make_sq(self, item_type):
         sq_name = self._sq_name_by_item_type[item_type]
         return getattr(self, sq_name)
 
-    def suggest_display_name(self):
-        """Returns a short name for the database mapping.
-
-        Returns:
-            str: suggested name for the database for display purposes.
-        """
-        if not self.sa_url.drivername.startswith("sqlite"):
-            return self.sa_url.database
-        if self.sa_url.database is not None:
-            return os.path.splitext(os.path.basename(self.sa_url.database))[0]
-        hashing = hashlib.sha1()
-        hashing.update(bytes(str(time.time()), "utf-8"))
-        return hashing.hexdigest()
-
     @staticmethod
     def get_upgrade_db_prompt_data(url, create=False):
         """Returns data to prompt the user what to do if the DB at the given url is not the latest version.

tests/test_DatabaseMapping.py

@@ -93,12 +93,6 @@ def test_shorthand_filter_query_works(self):
 
 
 class TestDatabaseMapping(AssertSuccessTestCase):
-    def test_suggest_display_name(self):
-        with TemporaryDirectory() as temp_dir:
-            url = "sqlite:///" + os.path.join(temp_dir, "my_precious_database.sqlite")
-            with DatabaseMapping(url, create=True) as db_map:
-                self.assertEqual(db_map.suggest_display_name(), "my_precious_database")
-
     def test_active_by_default_is_initially_true_for_zero_dimensional_entity_class(self):
         with DatabaseMapping("sqlite://", create=True) as db_map:
             item = self._assert_success(db_map.add_entity_class_item(name="Entity"))