⚡️(backend) stop using LEFT(value, LENGTH(path)) in sql queries

Comparing path with LEFT(value, LENGTH(path)) makes a sequential scan on
all the Document table, the more this table grow, the more the query
using it will be slow. We dediced instead to lookup on the path
extracting all ancestors path for a given document and then make a path
IN statement to use the index existing on the path column.

src/backend/core/api/viewsets.py

@@ -23,7 +23,7 @@ from django.core.validators import URLValidator
 from django.db import DatabaseError, connection, transaction
 from django.db import models as db
 from django.db.models.expressions import RawSQL
-from django.db.models.functions import Greatest, Left, Length
+from django.db.models.functions import Greatest
 from django.http import Http404, StreamingHttpResponse
 from django.urls import reverse
 from django.utils import timezone
@@ -1752,7 +1752,7 @@ class DocumentViewSet(
         # document. Filter to get the minimum access date for the logged-in user
         access_queryset = models.DocumentAccess.objects.filter(
             db.Q(user=user) | db.Q(team__in=user.teams),
-            document__path=Left(db.Value(document.path), Length("document__path")),
+            document__path__in=document.get_self_and_ancestors_paths(),
         ).aggregate(min_date=db.Min("created_at"))
 
         # Handle the case where the user has no accesses
@@ -1792,7 +1792,7 @@ class DocumentViewSet(
             access.created_at
             for access in models.DocumentAccess.objects.filter(
                 db.Q(user=user) | db.Q(team__in=user.teams),
-                document__path=Left(db.Value(document.path), Length("document__path")),
+                document__path__in=document.get_self_and_ancestors_paths(),
             )
         )