website refactor

adapters/bootstrap/racing/RacingMembershipFactory.ts

@@ -105,16 +105,22 @@ export class RacingMembershipFactory {
     }
 
     // Spread remaining drivers across remaining leagues to create realistic overlap.
+    // IMPORTANT: in postgres mode league ids are UUIDs, so never parse numeric suffixes from ids.
     for (const driver of drivers) {
       const driverId = driver.id.toString();
-      const driverNumber = Number(driverId.split('-')[1]);
 
       for (const league of leagues) {
         const leagueId = league.id.toString();
         if (leagueId === seedId('league-5', this.persistence)) continue;
         if (emptyLeagueId && leagueId === emptyLeagueId) continue;
 
-        if (driverNumber % 11 === 0 && leagueId === seedId('league-3', this.persistence)) {
+        // Deterministic membership distribution that works with UUID ids.
+        // Use stable hash of (driverId + leagueId) rather than parsing numeric suffixes.
+        const distKey = `${driverId}:${leagueId}`;
+        const dist = this.stableHash(distKey);
+
+        // Some inactive memberships for league-3 to exercise edge cases.
+        if (leagueId === seedId('league-3', this.persistence) && dist % 11 === 0) {
           add({
             leagueId,
             driverId,
@@ -126,7 +132,7 @@ export class RacingMembershipFactory {
         }
 
         // Sparse membership distribution (not every driver in every league)
-        if ((driverNumber + Number(leagueId.split('-')[1] ?? 0)) % 9 === 0) {
+        if (dist % 9 === 0) {
           add({
             leagueId,
             driverId,
@@ -330,6 +336,15 @@ export class RacingMembershipFactory {
     return registrations;
   }
 
+  private stableHash(input: string): number {
+    // Simple deterministic string hash (non-crypto), stable across runs.
+    let hash = 0;
+    for (let i = 0; i < input.length; i++) {
+      hash = (hash * 31 + input.charCodeAt(i)) | 0;
+    }
+    return Math.abs(hash);
+  }
+
   private addDays(date: Date, days: number): Date {
     return new Date(date.getTime() + days * 24 * 60 * 60 * 1000);
   }