Note: Drop this when bitcoindevkit#1172 is merged

adds Wallet methods `set_lookahead_for_all`,
`apply_block_relevant`, `batch_insert_relevant_unconfirmed`

crates/bdk/src/wallet/mod.rs

@@ -2309,6 +2309,57 @@ impl<D> Wallet<D> {
     pub fn local_chain(&self) -> &LocalChain {
         &self.chain
     }
+
+    /// Set lookahead for all keychains.
+    ///
+    /// Passing a lookahead of 0 will result in an error. This is because if we sync
+    /// the chain with a lookahead of 0, we would not find any update since we don't
+    /// have any scripts stored.
+    pub fn set_lookahead_for_all(&mut self, lookahead: u32) {
+        const DEFAULT_KEYCHAIN_LOOKAHEAD: u32 = 10;
+
+        self.indexed_graph.index.set_lookahead_for_all(
+            if lookahead > 0 {
+                lookahead
+            } else {
+                DEFAULT_KEYCHAIN_LOOKAHEAD
+            }
+        );
+    }
+
+    /// Insert all the block's relevant transactions into the IndexedTxGraph.
+    pub fn apply_block_relevant(
+        &mut self,
+        block: bitcoin::Block,
+        height: u32,
+    ) -> Result<(), CannotConnectError>
+    where
+        D: PersistBackend<ChangeSet>,
+    {
+        let chain_update = CheckPoint::from_header(&block.header, height).into_update(false);
+        let mut changeset = ChangeSet::from(self.chain.apply_update(chain_update)?);
+        changeset.append(ChangeSet::from(
+            self.indexed_graph.apply_block_relevant(block, height),
+        ));
+        self.persist.stage(changeset);
+        Ok(())
+    }
+
+    /// Batch insert unconfirmed transactions into the IndexedTxGraph.
+    /// Filtering out those that are not relevant.
+    ///
+    /// Read more here: [`self.indexed_graph.batch_insert_relevant_unconfirmed()`]
+    pub fn batch_insert_relevant_unconfirmed<'t>(
+        &mut self,
+        unconfirmed_txs: impl IntoIterator<Item = (&'t Transaction, u64)>,
+    ) where
+        D: PersistBackend<ChangeSet>,
+    {
+        let indexed_graph_changeset = self
+            .indexed_graph
+            .batch_insert_relevant_unconfirmed(unconfirmed_txs);
+        self.persist.stage(ChangeSet::from(indexed_graph_changeset));
+    }
 }
 
 impl<D> AsRef<bdk_chain::tx_graph::TxGraph<ConfirmationTimeHeightAnchor>> for Wallet<D> {