diff --git a/foxnouns/app.py b/foxnouns/app.py
index 9479fe2..af561a8 100644
--- a/foxnouns/app.py
+++ b/foxnouns/app.py
@@ -6,8 +6,10 @@ from . import blueprints
 from .db.aio import async_session
 from .db.util import validate_token
 from .exceptions import ErrorCode, ExpectedError
+from .settings import SECRET_KEY, BASE_DOMAIN
 
-app = Quart(__name__)
+app = Quart(__name__, host_matching=True, static_host=BASE_DOMAIN)
+app.secret_key = SECRET_KEY
 app = cors(
     app,
     allow_origin="*",
diff --git a/foxnouns/settings.py b/foxnouns/settings.py
index 17e3daf..a5e352a 100644
--- a/foxnouns/settings.py
+++ b/foxnouns/settings.py
@@ -24,6 +24,7 @@ with env.prefixed("MINIO_"):
         "SECRET_KEY": env("SECRET_KEY"),
         "BUCKET": env("BUCKET"),
         "SECURE": env.bool("SECURE", True),
+        "REGION": env("REGION", "auto"),
     }
 
 # The base domain the API is served on. This must be set.
diff --git a/foxnouns/tasks.py b/foxnouns/tasks.py
index 9a56dcc..052d1f4 100644
--- a/foxnouns/tasks.py
+++ b/foxnouns/tasks.py
@@ -21,11 +21,16 @@ minio = Minio(
     access_key=MINIO["ACCESS_KEY"],
     secret_key=MINIO["SECRET_KEY"],
     secure=MINIO["SECURE"],
+    region=MINIO["REGION"],
 )
 bucket = MINIO["BUCKET"]
 
 
 def convert_avatar(uri: str) -> bytes:
+    """Converts a base64 data URI into a WebP image.
+    Images are resized and cropped to 512x512 and exported with quality 95.
+    Only PNG, WebP, and JPEG images are allowed as input."""
+
     if not uri.startswith("data:image/"):
         raise ValueError("Not a data URI")
 
@@ -45,6 +50,9 @@ def convert_avatar(uri: str) -> bytes:
 
 @app.task
 def process_user_avatar(user_id: int, avatar: str) -> None:
+    """Processes an avatar string, uploads it to S3, and updates the user's avatar hash.
+    Also deletes the old avatar if one was already set."""
+
     with session() as conn:
         user = conn.scalar(select(User).where(User.id == user_id))
     if not user:
@@ -66,12 +74,14 @@ def process_user_avatar(user_id: int, avatar: str) -> None:
         conn.execute(update(User).values(avatar=hash).where(User.id == user_id))
         conn.commit()
 
-    if old_hash:
+    if old_hash and old_hash != hash:
         minio.remove_object(bucket, f"users/{user_id}/avatars/{old_hash}.webp")
 
 
 @app.task
 def delete_user_avatar(user_id: int) -> None:
+    """Deletes a user's avatar."""
+
     with session() as conn:
         user = conn.scalar(select(User).where(User.id == user_id))
     if not user:
@@ -91,6 +101,9 @@ def delete_user_avatar(user_id: int) -> None:
 
 @app.task
 def process_member_avatar(member_id: int, avatar: str) -> None:
+    """Processes an avatar string, uploads it to S3, and updates the member's avatar hash.
+    Also deletes the old avatar if one was already set."""
+
     with session() as conn:
         member = conn.scalar(select(Member).where(Member.id == member_id))
     if not member:
@@ -114,12 +127,14 @@ def process_member_avatar(member_id: int, avatar: str) -> None:
         conn.execute(update(Member).values(avatar=hash).where(Member.id == member_id))
         conn.commit()
 
-    if old_hash:
+    if old_hash and old_hash != hash:
         minio.remove_object(bucket, f"members/{member_id}/avatars/{old_hash}.webp")
 
 
 @app.task
 def delete_member_avatar(member_id: int) -> None:
+    """Deletes a member's avatar."""
+
     with session() as conn:
         member = conn.scalar(select(Member).where(Member.id == member_id))
     if not member: