Conditional contact cleanup

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

@@ -94,6 +94,11 @@ public interface DaoContact {
             " GROUP BY name, email")
     List<EntityContact> searchContacts(Long account, Integer type, String query);
 
+    @Query("SELECT COUNT(*) FROM contact" +
+            " WHERE (type = " + EntityContact.TYPE_TO +
+            " OR type = " + EntityContact.TYPE_FROM + ")")
+    int countContacts();
+
     @Insert
     long insertContact(EntityContact contact);
 

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

@@ -51,7 +51,8 @@ public class WorkerCleanup extends Worker {
     private static final int CLEANUP_INTERVAL = 4; // hours
     private static final long KEEP_FILES_DURATION = 3600 * 1000L; // milliseconds
     private static final long KEEP_IMAGES_DURATION = 3 * 24 * 3600 * 1000L; // milliseconds
-    private static final long KEEP_CONTACTS_DURATION = 180 * 24 * 3600 * 1000L; // milliseconds
+    private static final long KEEP_CONTACTS_DURATION = 365 * 24 * 3600 * 1000L; // milliseconds
+    private static final int KEEP_CONTACTS_COUNT = 10000;
 
     private static Semaphore semaphore = new Semaphore(1);
 
@@ -349,9 +350,11 @@ public class WorkerCleanup extends Worker {
             Log.i("Cleanup contacts");
             try {
                 db.beginTransaction();
-                int contacts = db.contact().deleteContacts(now - KEEP_CONTACTS_DURATION);
+                int contacts = db.contact().countContacts();
+                int deleted = (contacts < KEEP_CONTACTS_COUNT ? 0 :
+                        db.contact().deleteContacts(now - KEEP_CONTACTS_DURATION));
                 db.setTransactionSuccessful();
-                Log.i("Deleted contacts=" + contacts);
+                Log.i("Contacts=" + contacts + " deleted=" + deleted);
             } finally {
                 db.endTransaction();
             }