refactor(backend): ♻️ cleanup HTTP service classes and remove database singleton (#687)

* refactor(backend): ♻️ cleanup duplicate code in http services

* refactor(backend): ♻️ refactor database away from singleton design

removed the database single and instead injected the session into a new Database class that is created during each request life-cycle. Now sessions no longer need to be passed into each method on the database

All tests pass, but there are likely some hidden breaking changes that were not discovered.

* fix venv

* disable venv cache

* fix install script

* bump poetry version

* postgres fixes

* revert install

* fix db initialization for postgres

* add postgres to docker

* refactor(backend): ♻️ cleanup unused and duplicate code in http services

* refactor(backend): remove sessions from arguments

* refactor(backend): ♻️ convert units and ingredients to use http service class

* test(backend): ✅ add unit and food tests

* lint

* update tags

* re-enable cache

* fix missing fraction in db

* fix lint

Co-authored-by: hay-kot <hay-kot@pm.me>

mealie/services/recipe/recipe_unit_service.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from functools import cached_property
+
+from mealie.schema.recipe.recipe_ingredient import CreateIngredientUnit, IngredientUnit
+from mealie.services._base_http_service.crud_http_mixins import CrudHttpMixins
+from mealie.services._base_http_service.http_services import UserHttpService
+from mealie.services.events import create_recipe_event
+
+
+class RecipeUnitService(
+    CrudHttpMixins[IngredientUnit, CreateIngredientUnit, CreateIngredientUnit],
+    UserHttpService[int, IngredientUnit],
+):
+    event_func = create_recipe_event
+    _restrict_by_group = False
+    _schema = IngredientUnit
+
+    @cached_property
+    def dal(self):
+        return self.db.ingredient_units
+
+    def populate_item(self, id: int) -> IngredientUnit:
+        self.item = self.dal.get_one(id)
+        return self.item
+
+    def get_all(self) -> list[IngredientUnit]:
+        return self.dal.get_all()
+
+    def create_one(self, data: CreateIngredientUnit) -> IngredientUnit:
+        return self._create_one(data)
+
+    def update_one(self, data: IngredientUnit, item_id: int = None) -> IngredientUnit:
+        return self._update_one(data, item_id)
+
+    def delete_one(self, id: int = None) -> IngredientUnit:
+        return self._delete_one(id)