Align with fractal-server=1.2.5

[tcompa]

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[tcompa]

CI passes with 1.2.4, but it fails with 1.2.5.
The likely candidate for this behavior, on the fractal-server side, is this diff ($ git diff 1.2.4 1.2.5 fractal_server/app/db/__init__.py):

diff --git a/fractal_server/app/db/__init__.py b/fractal_server/app/db/__init__.py
index 9a3cf371..69dedc2f 100644
--- a/fractal_server/app/db/__init__.py
+++ b/fractal_server/app/db/__init__.py
@@ -10,6 +10,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.ext.asyncio import create_async_engine
 from sqlalchemy.orm import Session as DBSyncSession
 from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
 
 from ...config import get_settings
 from ...logger import set_logger
@@ -52,18 +53,28 @@ class DB:
                 "the database cannot be guaranteed."
             )
 
+        # Set some sqlite-specific options
+        if settings.DB_ENGINE == "sqlite":
+            engine_kwargs_async = dict(poolclass=StaticPool)
+            engine_kwargs_sync = dict(
+                poolclass=StaticPool,
+                connect_args={"check_same_thread": False},
+            )
+        else:
+            engine_kwargs_async = {}
+            engine_kwargs_sync = {}
+
         cls._engine_async = create_async_engine(
-            settings.DATABASE_URL, echo=settings.DB_ECHO, future=True
+            settings.DATABASE_URL,
+            echo=settings.DB_ECHO,
+            future=True,
+            **engine_kwargs_async,
         )
         cls._engine_sync = create_engine(
             settings.DATABASE_SYNC_URL,
             echo=settings.DB_ECHO,
             future=True,
-            connect_args=(
-                {"check_same_thread": False}
-                if settings.DB_ENGINE == "sqlite"
-                else {}
-            ),
+            **engine_kwargs_sync,
         )
 
         cls._async_session_maker = sessionmaker(

[tcompa]

EDIT:
1.2.4 fails with the usual "twophase" error, which is known on the fractal-server side (ref fractal-analytics-platform/fractal-server#661). This is actually expected.

[tcompa]

What is unexpected, however, is that 1.2.5 also fails - with a bunch of httpx.ReadTimeout. This is clearly a CI problem, since going through a manual test (startup a fractal-server instance, and use the fractal client as in fractal-demos) does work.

[github-actions]

Coverage report

The coverage rate went from 92.35% to 92.44% ⬆️
The branch rate is 83%.

None of the new lines are part of the tested code. Therefore, there is no coverage data about them.

[tcompa]

For the record, if we switched back from StaticPool to NullPool (in the sqlite engine), tests would pass.

EDIT: more precisely, to make the tests pass it is enough to switch to NullPool for the sync db engine.