From c92aec14d328ba58400699d6fab21f96e950e891 Mon Sep 17 00:00:00 2001
From: Thomas Richter <git@tricnet.de>
Date: Sun, 1 Feb 2026 23:13:50 +0100
Subject: [PATCH] feat: auto-cleanup orphaned tags when removed from entries

Tags that are no longer associated with any entry are automatically
deleted from the database when a tag is removed from an entry.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 src/lib/server/db/repository.ts | 10 ++++++++++
 src/routes/+page.server.ts      |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/src/lib/server/db/repository.ts b/src/lib/server/db/repository.ts
index e4dadee..c4715db 100644
--- a/src/lib/server/db/repository.ts
+++ b/src/lib/server/db/repository.ts
@@ -158,6 +158,7 @@ export interface TagRepository {
 	getById(id: string): Tag | undefined;
 	getByEntryId(entryId: string): Tag[];
 	updateEntryTags(entryId: string, tagNames: string[]): void;
+	cleanupOrphanedTags(): number;
 }
 
 class SQLiteTagRepository implements TagRepository {
@@ -215,6 +216,15 @@ class SQLiteTagRepository implements TagRepository {
 			db.insert(entryTags).values({ entryId, tagId: tag.id }).run();
 		}
 	}
+
+	cleanupOrphanedTags(): number {
+		// Delete tags that are not associated with any entry
+		const result = db.run(sql`
+			DELETE FROM tags
+			WHERE id NOT IN (SELECT DISTINCT tag_id FROM entry_tags)
+		`);
+		return result.changes;
+	}
 }
 
 export const tagRepository: TagRepository = new SQLiteTagRepository();
diff --git a/src/routes/+page.server.ts b/src/routes/+page.server.ts
index 4539bb9..ea4f215 100644
--- a/src/routes/+page.server.ts
+++ b/src/routes/+page.server.ts
@@ -342,6 +342,9 @@ export const actions: Actions = {
 		);
 		tagRepository.updateEntryTags(id, updatedTags);
 
+		// Clean up orphaned tags
+		tagRepository.cleanupOrphanedTags();
+
 		return { success: true };
 	}
 };