diff --git a/discord/models.py b/discord/models.py
index 66ee378..b16cdce 100644
--- a/discord/models.py
+++ b/discord/models.py
@@ -1,4 +1,4 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, NonNegativeInt
 from pypresence.types import ActivityType
 from typing import Optional
 
@@ -9,6 +9,6 @@ class DiscordRPCUpdatePayload(BaseModel):
     subtitle: str
     image_url: str
     details: str
-    start: Optional[int]
-    end: Optional[int]
+    start: Optional[NonNegativeInt]
+    end: Optional[NonNegativeInt]
     activity_type: ActivityType
diff --git a/jellyfin/models.py b/jellyfin/models.py
index d24a1d5..de467b4 100644
--- a/jellyfin/models.py
+++ b/jellyfin/models.py
@@ -1,4 +1,4 @@
-from pydantic import BaseModel, HttpUrl
+from pydantic import BaseModel, HttpUrl, NonNegativeInt
 from enum import StrEnum
 from typing import Optional, Union
 from discord.models import DiscordRPCUpdatePayload
@@ -29,8 +29,8 @@ class JellyfinMediaItem(BaseModel):
     name: str
     type: JellyfinMediaType
     image_url: HttpUrl
-    start: Optional[int]
-    end: Optional[int]
+    start: Optional[NonNegativeInt]
+    end: Optional[NonNegativeInt]
     metadata: Union[JellyfinMusicMediaMetadata,
                     JellyfinMovieMediaMetadata,
                     JellyfinEpisodeMediaMetadata]
diff --git a/main.py b/main.py
index a9a8475..054686e 100644
--- a/main.py
+++ b/main.py
@@ -5,28 +5,28 @@ import coloredlogs
 import logging
 import time
 
-coloredlogs.install(
-    level=logging.INFO,
-    fmt='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
-
-discordRPC = DiscordRPC()
-jellyfinApiClient = JellyfinApiClient()
-
 
 def main():
+    coloredlogs.install(
+        level=logging.INFO,
+        fmt='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+
+    discord_rpc = DiscordRPC()
+    jellyfin_api_client = JellyfinApiClient()
+
     while True:
         try:
-            media_item = jellyfinApiClient.get_current_playback()
+            media_item = jellyfin_api_client.get_current_playback()
             if not media_item:
-                discordRPC.clear()
+                discord_rpc.clear()
                 time.sleep(settings.poll_interval)
                 continue
 
-            discordRPC.update(media_item.to_rpc_payload())
+            discord_rpc.update(media_item.to_rpc_payload())
             time.sleep(settings.poll_interval)
         except KeyboardInterrupt:
             logging.info("Shutting down...")
-            discordRPC.clear()
+            discord_rpc.clear()
             break