fix(utils): deduplicate history entries by entityType+entityId

Adds runtime deduplication in getHistory() to keep only the most recent
visit per unique entity. This fixes duplicate history entries appearing
when the compound index didn't prevent duplicates (e.g., race conditions
or slightly different entityType values).

Author: Mearman

packages/utils/src/storage/catalogue-db.ts

@@ -1075,7 +1075,7 @@ export class CatalogueService {
 
   /**
    * Get all history entries
-   * Filters out corrupted entries at runtime (entityId or URL containing [object Object])
+   * Filters out corrupted entries and deduplicates to show only most recent visit per entity
    */
   async getHistory(): Promise<CatalogueEntity[]> {
     await this.initializeSpecialLists();
@@ -1100,7 +1100,7 @@ export class CatalogueService {
     // Non-entity pages that shouldn't be validated against entity patterns
     const nonEntityPatterns = ["/about", "/settings", "/history", "/bookmarks", "/catalogue", "/search"];
 
-    return entities.filter((entity) => {
+    const validEntities = entities.filter((entity) => {
       if (entity.entityId.length === 0) return false;
       if (entity.entityId.includes(CORRUPTED_ENTITY_ID_PATTERN)) return false;
       if (entity.entityId.includes(urlEncodedPattern)) return false;
@@ -1136,6 +1136,21 @@ export class CatalogueService {
 
       return true;
     });
+
+    // Deduplicate: keep only the most recent entry per unique entityType+entityId
+    // This handles cases where the compound index didn't prevent duplicates
+    // (e.g., race conditions, slightly different entityType values)
+    const seen = new Map<string, CatalogueEntity>();
+    for (const entity of validEntities) {
+      const key = `${entity.entityType}:${entity.entityId}`;
+      const existing = seen.get(key);
+      // Keep the entry with the most recent addedAt timestamp
+      if (!existing || entity.addedAt > existing.addedAt) {
+        seen.set(key, entity);
+      }
+    }
+
+    return Array.from(seen.values());
   }
 
   /**