Make Sqlite3 PRAGMAs customizable from settings

CHANGELOG.md

@@ -2,15 +2,16 @@
 
 ## Main branch
 
-Feat: Support `scripts key:typeclass` form to create global scripts
-with dynamic keys (rather than just relying on typeclass' key). Support
-searching using the same syntax (Griatch)
-[Fix][issue3556]: Better error if trying to treat ObjectDB as a typeclass (Griatch)
-[Fix][issue3590]: Make `examine` command properly show `strattr` type
+- Feat: Support `scripts key:typeclass` to create global scripts
+with dynamic keys (rather than just relying on typeclass' key) (Griatch)
+- [Feat][pull3595]: Tweak Sqlite3 PRAGMAs for better performance (0xDEADFED5)
+- Feat: Make Sqlite3 PRAGMAs configurable via settings (Griatch)
+- [Fix][issue3556]: Better error if trying to treat ObjectDB as a typeclass (Griatch)
+- [Fix][issue3590]: Make `examine` command properly show `strattr` type
 Attribute values (Griatch)
-[Fix][issue3519]: `GLOBAL_SCRIPTS` container didn't list global scripts not
+- [Fix][issue3519]: `GLOBAL_SCRIPTS` container didn't list global scripts not
 defined explicitly to be restarted/recrated in settings.py (Griatch)
-Fix: Passing an already instantiated Script to `obj.scripts.add` (`ScriptHandler.add`)
+- Fix: Passing an already instantiated Script to `obj.scripts.add` (`ScriptHandler.add`)
 did not add it to the handler's object (Griatch)
 [Docs][issue3591]: Fix of NPC reaction tutorial code (Griatch)
 
@@ -18,6 +19,7 @@ did not add it to the handler's object (Griatch)
 [issue3590]: https://github.com/evennia/evennia/issues/3590
 [issue3556]: https://github.com/evennia/evennia/issues/3556
 [issue3519]: https://github.com/evennia/evennia/issues/3519
+[pull3595]: https://github.com/evennia/evennia/pull/3595
 
 
 ## Evennia 4.3.0

evennia/server/service.py

@@ -8,20 +8,19 @@ import time
 import traceback
 
 import django
+import evennia
 from django.conf import settings
 from django.db import connection
 from django.db.utils import OperationalError
 from django.utils.translation import gettext as _
+from evennia.utils import logger
+from evennia.utils.utils import get_evennia_version, make_iter, mod_import
 from twisted.application import internet
 from twisted.application.service import MultiService
 from twisted.internet import defer, reactor
 from twisted.internet.defer import Deferred
 from twisted.internet.task import LoopingCall
 
-import evennia
-from evennia.utils import logger
-from evennia.utils.utils import get_evennia_version, make_iter, mod_import
-
 _SA = object.__setattr__
 
 
@@ -282,12 +281,10 @@ class EvenniaServerService(MultiService):
             and settings.DATABASES.get("default", {}).get("ENGINE", None)
             == "django.db.backends.sqlite3"
         ):
+            # sqlite3 database pragmas (directives)
             cursor = connection.cursor()
-            cursor.execute("PRAGMA cache_size=10000")
-            cursor.execute("PRAGMA synchronous=1")
-            cursor.execute("PRAGMA count_changes=OFF")
-            cursor.execute("PRAGMA temp_store=2")
-            cursor.execute("PRAGMA journal_mode=WAL")
+            for pragma in settings.SQLITE3_PRAGMAS:
+                cursor.execute(pragma)
 
     def update_defaults(self):
         """

evennia/settings_default.py

@@ -300,6 +300,16 @@ DATABASES = {
         "PORT": "",
     }
 }
+# PRAGMA (directives) for the default Sqlite3 database operations. This can be used to tweak
+# performance for your setup. Don't change this unless you know what # you are doing.
+SQLITE3_PRAGMAS = (
+    "PRAGMA cache_size=10000",
+    "PRAGMA synchronous=1",
+    "PRAGMA count_changes=OFF",
+    "PRAGMA temp_store=2",
+    "PRAGMA journal_mode=WAL",
+)
+
 # How long the django-database connection should be kept open, in seconds.
 # If you get errors about the database having gone away after long idle
 # periods, shorten this value (e.g. MySQL defaults to a timeout of 8 hrs)