perf(levm): fix FlatKeyValue generation on full sync mode

CHANGELOG.md

@@ -2,10 +2,16 @@
 
 ## Perf
 
+### 2025-11-11
+
+- Fix `FlatKeyValue` generation on fullsync mode [#5274](https://github.com/lambdaclass/ethrex/pull/5274)
+
 ### 2025-11-10
+
 - Disable RocksDB compression [#5223](https://github.com/lambdaclass/ethrex/pull/5223)
 
 ### 2025-11-07
+
 - Reuse stack pool in LEVM [#5179](https://github.com/lambdaclass/ethrex/pull/5179)
 
 ### 2025-11-03
@@ -14,6 +20,7 @@
 - Merge execution with some post-execution validations [#5170](https://github.com/lambdaclass/ethrex/pull/5170)
 
 ### 2025-10-31
+
 - Reduce overhead of trie opening [#5145](https://github.com/lambdaclass/ethrex/pull/5145)
 - Improved discovery and peer initialization [#5147](https://github.com/lambdaclass/ethrex/pull/5147)
 

cmd/ethrex/initializers.rs

@@ -395,6 +395,9 @@ pub async fn init_l1(
     ethrex_crypto::kzg::warm_up_trusted_setup();
 
     let store = init_store(datadir, genesis).await;
+    if opts.syncmode == SyncMode::Full {
+        store.generate_flatkeyvalue()?;
+    }
 
     #[cfg(feature = "sync-test")]
     set_sync_block(&store).await;