06/15 Phase 1 + 2 codes

app/services/trust.py

@@ -0,0 +1,31 @@
+"""Trust scoring. Append events, recompute score + tier.
+
+Phase 1 wiring: email verification grants trust. Listing-survival and flag
+penalties hook in during Phase 2/3. Thresholds are intentionally simple here.
+"""
+from app.extensions import db
+from app.models.trust import TrustEvent
+from app.models.enums import TrustEventType, TrustTier
+
+# tier thresholds by cumulative score
+_TIER_THRESHOLDS = [
+    (50, TrustTier.verified),
+    (20, TrustTier.trusted),
+    (5, TrustTier.basic),
+    (0, TrustTier.new),
+]
+
+
+def record_event(user, event_type: TrustEventType, delta: int):
+    """Append a trust event, bump score, recompute tier. Caller commits."""
+    db.session.add(TrustEvent(user_id=user.id, type=event_type, delta=delta))
+    user.trust_score = max(0, (user.trust_score or 0) + delta)
+    user.trust_tier = _tier_for(user.trust_score)
+    return user
+
+
+def _tier_for(score: int) -> TrustTier:
+    for threshold, tier in _TIER_THRESHOLDS:
+        if score >= threshold:
+            return tier
+    return TrustTier.new