Cleanup old local contacts

app/src/main/java/eu/faircode/email/DB.java

@@ -50,7 +50,7 @@ import io.requery.android.database.sqlite.RequerySQLiteOpenHelperFactory;
 // https://developer.android.com/topic/libraries/architecture/room.html
 
 @Database(
-        version = 56,
+        version = 57,
         entities = {
                 EntityIdentity.class,
                 EntityAccount.class,
@@ -615,6 +615,15 @@ public abstract class DB extends RoomDatabase {
                         db.execSQL("ALTER TABLE `contact` ADD COLUMN `favorite` INTEGER NOT NULL DEFAULT 0");
                     }
                 })
+                .addMigrations(new Migration(56, 57) {
+                    @Override
+                    public void migrate(SupportSQLiteDatabase db) {
+                        Log.i("DB migration from version " + startVersion + " to " + endVersion);
+                        db.execSQL("CREATE INDEX `index_contact_times_contacted` ON `contact` (`times_contacted`)");
+                        db.execSQL("CREATE INDEX `index_contact_last_contacted` ON `contact` (`last_contacted`)");
+                        db.execSQL("CREATE INDEX `index_contact_favorite` ON `contact` (`favorite`)");
+                    }
+                })
                 .build();
     }
 

app/src/main/java/eu/faircode/email/DaoContact.java

@@ -72,6 +72,12 @@ public interface DaoContact {
     @Query("DELETE FROM contact WHERE id= :id")
     int deleteContact(long id);
 
+    @Query("DELETE FROM contact" +
+            " WHERE last_contacted IS NOT NULL" +
+            " AND last_contacted < :before" +
+            " AND NOT favorite")
+    int deleteContacts(long before);
+
     @Query("DELETE FROM contact")
     int clearContacts();
 }

app/src/main/java/eu/faircode/email/EntityContact.java

@@ -40,6 +40,9 @@ import androidx.room.PrimaryKey;
         indices = {
                 @Index(value = {"email", "type"}, unique = true),
                 @Index(value = {"name", "type"}),
+                @Index(value = {"times_contacted"}),
+                @Index(value = {"last_contacted"}),
+                @Index(value = {"favorite"})
         }
 )
 public class EntityContact implements Serializable {

app/src/main/java/eu/faircode/email/WorkerCleanup.java

@@ -22,6 +22,7 @@ import androidx.work.WorkerParameters;
 public class WorkerCleanup extends Worker {
     private static final int CLEANUP_INTERVAL = 4; // hours
     private static final long CACHE_IMAGE_DURATION = 3 * 24 * 3600 * 1000L; // milliseconds
+    private static final long KEEP_CONTACTS_DURATION = 180 * 24 * 3600 * 1000L; // milliseconds
     private static final long KEEP_LOG_DURATION = 24 * 3600 * 1000L; // milliseconds
 
     public WorkerCleanup(@NonNull Context context, @NonNull WorkerParameters workerParams) {
@@ -112,9 +113,12 @@ public class WorkerCleanup extends Worker {
                                 Log.w("Error deleting " + file);
                         }
 
+            Log.i("Cleanup contacts");
+            int contacts = db.contact().deleteContacts(now - KEEP_CONTACTS_DURATION);
+            Log.i("Deleted contacts=" + contacts);
+
             Log.i("Cleanup log");
-            long before = now - KEEP_LOG_DURATION;
-            int logs = db.log().deleteLogs(before);
+            int logs = db.log().deleteLogs(now - KEEP_LOG_DURATION);
             Log.i("Deleted logs=" + logs);
 
             db.setTransactionSuccessful();