[fix] blockchain: avoid nested transactions

lib/modules/blockchain/bc-db-writer/src/blocks/fork_tree.rs

@@ -74,6 +74,7 @@ pub fn insert_new_fork_block(
 /// Modify the main branch (function to call after a successful roolback)
 pub fn change_main_branch(
     db: &Db,
+    w: &mut DbWriter,
     fork_tree: &mut ForkTree,
     old_current_blockstamp: Blockstamp,
     new_current_blockstamp: Blockstamp,
@@ -83,15 +84,12 @@ pub fn change_main_branch(
     let removed_blockstamps = fork_tree.get_removed_blockstamps();
 
     // Remove too old blocks
-    db.write(|mut w| {
     let fork_blocks_store = db.get_store(FORK_BLOCKS);
     for blockstamp in removed_blockstamps {
         let blockstamp_bytes: Vec<u8> = blockstamp.into();
         fork_blocks_store.delete(w.as_mut(), &blockstamp_bytes)?;
     }
-
-        Ok(w)
-    })
+    Ok(())
 }
 
 #[cfg(test)]

lib/modules/blockchain/blockchain/src/fork/rollback.rs

@@ -146,6 +146,7 @@ pub fn apply_rollback(bc: &mut BlockchainModule, new_bc_branch: Vec<Blockstamp>)
             // update main branch in fork tree
             if let Err(err) = durs_bc_db_writer::blocks::fork_tree::change_main_branch(
                 &db,
+                &mut w,
                 &mut bc.fork_tree,
                 old_current_blockstamp,
                 bc.current_blockstamp,