diff --git a/aperisolve/sentry.py b/aperisolve/sentry.py
index bb87683..e0677a4 100644
--- a/aperisolve/sentry.py
+++ b/aperisolve/sentry.py
@@ -12,35 +12,31 @@ from sentry_sdk.integrations.sqlalchemy import SqlalchemyIntegration
 from sentry_sdk.integrations.threading import ThreadingIntegration
 
 SENTRY_DSN = os.environ.get("SENTRY_DSN")
-ENVIRONMENT = os.environ.get("ENVIRONMENT", "development")
-
+SENTRY_ENVIRONMENT = os.environ.get("SENTRY_ENVIRONMENT", "development")
+SENTRY_TRACES_SAMPLE_RATE = float(os.environ.get("SENTRY_TRACES_SAMPLE_RATE", "0.1"))
+SENTRY_PROFILES_SAMPLE_RATE = float(os.environ.get("SENTRY_PROFILES_SAMPLE_RATE", "0.1"))
+SENTRY_RELEASE = os.environ.get("SENTRY_RELEASE", "1.0.0")
 
 def initialize_sentry() -> None:
     """Initialize Sentry SDK once, safely."""
 
     # No DSN → do nothing
-    dsn = os.environ.get("SENTRY_DSN")
-    if not dsn:
-        return
-
     # Prevent double initialization (Flask + RQ, CLI, tests, etc.)
-    if sentry_sdk.Hub.current.client is not None:
+    if not SENTRY_DSN or sentry_sdk.Hub.current.client is not None:
         return
 
     sentry_sdk.init(
-        dsn=dsn,
+        dsn=SENTRY_DSN,
         integrations=[
             FlaskIntegration(),
             SqlalchemyIntegration(),
             RqIntegration(),
             ThreadingIntegration(propagate_hub=True),
         ],
-        traces_sample_rate=float(os.environ.get("SENTRY_TRACES_SAMPLE_RATE", "0.1")),
-        profiles_sample_rate=float(
-            os.environ.get("SENTRY_PROFILES_SAMPLE_RATE", "0.1")
-        ),
-        environment=os.environ.get("ENVIRONMENT", "development"),
-        release=os.environ.get("SENTRY_RELEASE", "1.0.0"),
+        traces_sample_rate=SENTRY_TRACES_SAMPLE_RATE,
+        profiles_sample_rate=SENTRY_PROFILES_SAMPLE_RATE,
+        environment=SENTRY_ENVIRONMENT,
+        release=SENTRY_RELEASE,
         send_default_pii=False,
         enable_tracing=True,
     )