Tried this, the sqlite export misses information. For example converting to postgresql still needs to follow changes:
```ALTER TABLE "oc_filecache" ALTER size TYPE BIGINT;
ALTER TABLE "oc_filecache" ALTER unencrypted_size TYPE BIGINT;
ALTER TABLE "oc_locks" ALTER created TYPE BIGINT;
ALTER TABLE "oc_locks" ALTER scope TYPE SMALLINT;
ALTER TABLE "oc_locks" ALTER depth TYPE SMALLINT;
ALTER TABLE "oc_share" ALTER share_type TYPE SMALLINT;
ALTER TABLE "oc_share" ALTER permissions TYPE SMALLINT;
ALTER TABLE "oc_share" ALTER stime TYPE BIGINT;
ALTER TABLE "oc_share" ALTER accepted TYPE SMALLINT;
ALTER TABLE "oc_share" ALTER mail_send TYPE SMALLINT;
```
And this is only for the core tables, the app tables also have the wrong type in places