Split reporting Batches to the signer from the Batch test

processor/scanner/src/report/db.rs

@@ -0,0 +1,26 @@
+use serai_db::{Get, DbTxn, create_db};
+
+use serai_validator_sets_primitives::Session;
+
+create_db!(
+  ScannerBatch {
+    // The last session to sign a Batch and their first Batch signed
+    LastSessionToSignBatchAndFirstBatch: () -> (Session, u32),
+  }
+);
+
+pub(crate) struct BatchDb;
+impl BatchDb {
+  pub(crate) fn set_last_session_to_sign_batch_and_first_batch(
+    txn: &mut impl DbTxn,
+    session: Session,
+    id: u32,
+  ) {
+    LastSessionToSignBatchAndFirstBatch::set(txn, &(session, id));
+  }
+  pub(crate) fn last_session_to_sign_batch_and_first_batch(
+    getter: &impl Get,
+  ) -> Option<(Session, u32)> {
+    LastSessionToSignBatchAndFirstBatch::get(getter)
+  }
+}