diff --git a/app/services/formula_engine.py b/app/services/formula_engine.py
index c863051..2e55a65 100644
--- a/app/services/formula_engine.py
+++ b/app/services/formula_engine.py
@@ -90,13 +90,23 @@ def tier_from_value(value: float, track) -> int:
 
     Args:
         value: Computed formula value.
-        track: Object (or dict-like) with t1, t2, t3, t4 attributes/keys.
+        track: Object (or dict-like) with t1_threshold..t4_threshold attributes/keys.
     """
     # Support both attribute-style (Peewee model) and dict (seed fixture)
     if isinstance(track, dict):
-        t1, t2, t3, t4 = track["t1"], track["t2"], track["t3"], track["t4"]
+        t1, t2, t3, t4 = (
+            track["t1_threshold"],
+            track["t2_threshold"],
+            track["t3_threshold"],
+            track["t4_threshold"],
+        )
     else:
-        t1, t2, t3, t4 = track.t1, track.t2, track.t3, track.t4
+        t1, t2, t3, t4 = (
+            track.t1_threshold,
+            track.t2_threshold,
+            track.t3_threshold,
+            track.t4_threshold,
+        )
 
     if value >= t4:
         return 4
diff --git a/tests/test_formula_engine.py b/tests/test_formula_engine.py
index 67c14a9..435cd92 100644
--- a/tests/test_formula_engine.py
+++ b/tests/test_formula_engine.py
@@ -43,9 +43,27 @@ def pitcher_stats(**kwargs):
 def track_dict(card_type: str) -> dict:
     """Return the locked threshold dict for a given card_type."""
     return {
-        "batter": {"card_type": "batter", "t1": 37, "t2": 149, "t3": 448, "t4": 896},
-        "sp": {"card_type": "sp", "t1": 10, "t2": 40, "t3": 120, "t4": 240},
-        "rp": {"card_type": "rp", "t1": 3, "t2": 12, "t3": 35, "t4": 70},
+        "batter": {
+            "card_type": "batter",
+            "t1_threshold": 37,
+            "t2_threshold": 149,
+            "t3_threshold": 448,
+            "t4_threshold": 896,
+        },
+        "sp": {
+            "card_type": "sp",
+            "t1_threshold": 10,
+            "t2_threshold": 40,
+            "t3_threshold": 120,
+            "t4_threshold": 240,
+        },
+        "rp": {
+            "card_type": "rp",
+            "t1_threshold": 3,
+            "t2_threshold": 12,
+            "t3_threshold": 35,
+            "t4_threshold": 70,
+        },
     }[card_type]