Add real Solana wallet observation and raw transaction persistence

tests/mocks/InMemoryRepositories.ts

@@ -4,6 +4,7 @@ import {
   ITradeRepository,
   ISimulationExecutionRepository,
   IEventJournalRepository,
+  IRawWalletTransactionRepository,
 } from '../../src/domain/interfaces.js';
 import {
   WatchedWallet,
@@ -11,6 +12,7 @@ import {
   Trade,
   SimulatedExecution,
   EventJournalEntry,
+  RawWalletTransaction,
 } from '../../src/domain/models.js';
 
 export class InMemoryWalletRepository implements IWalletRepository {
@@ -132,3 +134,18 @@ export class InMemoryStrategyRunsRepository {
     this.runs.push(run);
   }
 }
+
+export class InMemoryRawWalletTransactionRepository implements IRawWalletTransactionRepository {
+  public transactions: RawWalletTransaction[] = [];
+
+  async saveTransaction(tx: RawWalletTransaction): Promise<void> {
+    const existing = this.transactions.find((t) => t.transactionSignature === tx.transactionSignature);
+    if (!existing) {
+      this.transactions.push(tx);
+    }
+  }
+
+  async getTransactionBySignature(signature: string): Promise<RawWalletTransaction | null> {
+    return this.transactions.find((t) => t.transactionSignature === signature) || null;
+  }
+}