Remove the EventDb from Tributary scanner

We used per-Transaction DB TXNs so on error, we don't have to rescan the entire
block yet only the rest of it. We prevented scanning multiple transactions by
tracking which we already had.

This is over-engineered and not worth it.

coordinator/src/tributary/db.rs

@@ -42,7 +42,7 @@ pub enum Accumulation {
 }
 
 create_db!(
-  NewTributary {
+  Tributary {
     SeraiBlockNumber: (hash: [u8; 32]) -> u64,
     LastBlock: (genesis: [u8; 32]) -> [u8; 32],
     FatalSlashes: (genesis: [u8; 32]) -> Vec<[u8; 32]>,
@@ -57,7 +57,6 @@ create_db!(
     AttemptDb: (genesis: [u8; 32], topic: &Topic) -> u32,
     DataReceived: (genesis: [u8; 32], data_spec: &DataSpecification) -> u16,
     DataDb: (genesis: [u8; 32], data_spec: &DataSpecification, signer_bytes: &[u8; 32]) -> Vec<u8>,
-    EventDb: (id: [u8; 32], index: u32) -> (),
   }
 );
 
@@ -152,10 +151,3 @@ impl DataDb {
     Accumulation::NotReady
   }
 }
-
-impl EventDb {
-  pub fn handle_event(txn: &mut impl DbTxn, id: [u8; 32], index: u32) {
-    assert!(Self::get(txn, id, index).is_none());
-    Self::set(txn, id, index, &());
-  }
-}

coordinator/src/tributary/scanner.rs

@@ -24,7 +24,7 @@ use crate::{
   Db,
   tributary::handle::{fatal_slash, handle_application_tx},
   processors::Processors,
-  tributary::{TributarySpec, Transaction, LastBlock, EventDb},
+  tributary::{TributarySpec, Transaction, LastBlock},
   P2p,
 };
 
@@ -70,18 +70,8 @@ async fn handle_block<
 ) {
   log::info!("found block for Tributary {:?}", spec.set());
 
-  let hash = block.hash();
-
-  let mut event_id = 0;
-  #[allow(clippy::explicit_counter_loop)] // event_id isn't TX index. It just currently lines up
+  let mut txn = db.txn();
   for tx in block.transactions {
-    if EventDb::get(db, hash, event_id).is_some() {
-      event_id += 1;
-      continue;
-    }
-
-    let mut txn = db.txn();
-
     match tx {
       TributaryTransaction::Tendermint(TendermintTx::SlashEvidence(ev)) => {
         // Since the evidence is on the chain, it should already have been validated
@@ -130,12 +120,8 @@ async fn handle_block<
         .await;
       }
     }
-
-    EventDb::handle_event(&mut txn, hash, event_id);
-    txn.commit();
-
-    event_id += 1;
   }
+  txn.commit();
 
   // TODO: Trigger any necessary re-attempts
 }