backend: Remove no longer needed TemporarySchedulerBackend class

A memory backend was recently introduced so that temporary backend
relying on a postgresql server is no longer needed.

pyproject.toml

@@ -38,7 +38,6 @@ testing = {file = [
 [project.entry-points."swh.scheduler.classes"]
 "postgresql" = "swh.scheduler.backend:SchedulerBackend"
 "remote" = "swh.scheduler.api.client:RemoteScheduler"
-"temporary" = "swh.scheduler.backend:TemporarySchedulerBackend"
 "memory" = "swh.scheduler.in_memory:InMemoryScheduler"
 
 [project.urls]

requirements.txt

@@ -17,5 +17,4 @@ requests
 tabulate
 sentry-sdk
 setuptools
-testing.postgresql
 typing-extensions

swh/scheduler/backend.py

@@ -14,11 +14,9 @@ from psycopg2.errors import CardinalityViolation
 from psycopg2.extensions import AsIs
 import psycopg2.extras
 import psycopg2.pool
-from testing.postgresql import Postgresql
 
 from swh.core.db import BaseDb
 from swh.core.db.common import db_transaction
-from swh.core.db.db_utils import init_admin_extensions, populate_database_for_package
 from swh.scheduler.model import (
     Task,
     TaskArguments,
@@ -1311,20 +1309,3 @@ class SchedulerBackend:
 
         cur.execute(query, tuple(where_args))
         return [SchedulerMetrics(**row) for row in cur.fetchall()]
-
-
-class TemporarySchedulerBackend(SchedulerBackend):
-    """Temporary postgresql backend for the Software Heritage scheduling database.
-
-    A temporary scheduler database is spawned then removed when the backend
-    gets destroyed.
-
-    It can be used for testing SWH components that require a scheduler instance
-    (listers for instance).
-    """
-
-    def __init__(self):
-        self.postgresql = Postgresql()
-        init_admin_extensions("swh.scheduler", self.postgresql.url())
-        populate_database_for_package("swh.scheduler", self.postgresql.url())
-        super().__init__(self.postgresql.url())

swh/scheduler/tests/test_temporary.py

-# Copyright (C) 2023  The Software Heritage developers
-# See the AUTHORS file at the top-level directory of this distribution
-# License: GNU General Public License version 3, or any later version
-# See top-level LICENSE file for more information
-
-import pytest
-from testing.postgresql import find_program
-
-from .test_scheduler import TestScheduler as TestTemporaryScheduler  # noqa: F401
-
-
-def _has_initdb():
-    try:
-        find_program("initdb", ["bin"])
-    except RuntimeError:
-        return False
-    else:
-        return True
-
-
-@pytest.fixture
-def swh_scheduler_class():
-    return "temporary"
-
-
-@pytest.fixture
-def swh_scheduler_config():
-    return {}
-
-
-pytestmark = pytest.mark.skipif(
-    not _has_initdb(), reason="initdb executable is missing"
-)