feat: implement t-604 keyword prompt moderation

apps/moderation/versioning.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from uuid import uuid4
+
+from django.conf import settings
+from django.core.cache import cache
+
+
+def sensitive_words_version_key() -> str:
+    return str(
+        getattr(
+            settings,
+            "MODERATION_CACHE_VERSION_KEY",
+            "moderation:sensitive_words:version",
+        )
+        or "moderation:sensitive_words:version"
+    )
+
+
+def get_sensitive_words_version() -> str:
+    return str(cache.get(sensitive_words_version_key()) or "0")
+
+
+def bump_sensitive_words_version() -> str:
+    version = uuid4().hex
+    cache.set(sensitive_words_version_key(), version, timeout=None)
+    return version