Don't bring back extension stores removed during a refresh

A store's refreshed details are written only if the store still exists when its fetch returns, so one removed while its index was loading stays removed. The unused get query becomes contains.

data/src/main/java/mihon/data/extension/repository/ExtensionStoreRepositoryImpl.kt

@@ -1,6 +1,7 @@
 package mihon.data.extension.repository
 
 import app.cash.sqldelight.async.coroutines.awaitAsList
+import app.cash.sqldelight.async.coroutines.awaitAsOne
 import dev.zacsweers.metro.AppScope
 import dev.zacsweers.metro.ContributesBinding
 import dev.zacsweers.metro.Inject
@@ -49,6 +50,9 @@ class ExtensionStoreRepositoryImpl(
                 service.fetch(store.index_url)
                     .mapCatching {
                         database.transaction {
+                            if (!database.extension_storeQueries.contains(store.index_url).awaitAsOne()) {
+                                return@transaction
+                            }
                             upsert(it)
                             if (store.index_url != it.indexUrl) {
                                 database.extension_storeQueries.delete(store.index_url)

data/src/main/sqldelight/tachiyomi/data/extension_store.sq

@@ -11,10 +11,8 @@ CREATE TABLE extension_store(
     extension_list_url TEXT
 );
 
-get:
-SELECT *
-FROM extension_store
-WHERE index_url = :indexUrl;
+contains:
+SELECT EXISTS(SELECT 0 FROM extension_store WHERE index_url = :indexUrl);
 
 getAll:
 SELECT *