diff --git a/changelog.d/fixes/16005-usage-reset-keeps-token-ledger.md b/changelog.d/fixes/16005-usage-reset-keeps-token-ledger.md
new file mode 100644
index 000000000000..4ccecfce8343
--- /dev/null
+++ b/changelog.d/fixes/16005-usage-reset-keeps-token-ledger.md
@@ -0,0 +1 @@
+- **fix(db):** keep token_ledger when resetting usage data ([#16005](https://github.com/diegosouzapw/OmniRoute/pull/16005)) — thanks @pacocartones
diff --git a/src/lib/db/cleanup.ts b/src/lib/db/cleanup.ts
index 5b10d9e8ae6a..2ae6536b8469 100644
--- a/src/lib/db/cleanup.ts
+++ b/src/lib/db/cleanup.ts
@@ -827,6 +827,11 @@ export interface ResetUsageHistoryResult extends CleanupResult {
   deletedCompressionRunTelemetry: number;
   deletedRoutingDecisions: number;
   deletedQuotaConsumption: number;
+  /**
+   * Always 0. `token_ledger` is the transfer record behind token balances and
+   * idempotency keys, not usage analytics, so a usage reset never deletes it.
+   * The field stays so the response shape of the purge API does not change.
+   */
   deletedTokenLedger: number;
   deletedConversationTurnNodes: number;
   deletedAgenticConversations: number;
@@ -910,7 +915,6 @@ const RESET_TARGETS: Array<
     cutoff: "epochMs",
     resultKey: "deletedQuotaConsumption",
   },
-  { table: "token_ledger", column: "created_at", cutoff: "iso", resultKey: "deletedTokenLedger" },
   {
     table: "conversation_turn_nodes",
     column: "last_seen_at",
diff --git a/tests/unit/usage-history-reset-token-ledger.test.ts b/tests/unit/usage-history-reset-token-ledger.test.ts
new file mode 100644
index 000000000000..01adaae03f90
--- /dev/null
+++ b/tests/unit/usage-history-reset-token-ledger.test.ts
@@ -0,0 +1,61 @@
+/**
+ * The on-demand "Reset usage data" action wipes usage analytics. `token_ledger`
+ * is not analytics: it is the record of token transfers between API keys,
+ * balances are computed from it (`getBalance`) and `idempotency_key` is what
+ * makes a retried transfer a no-op. Deleting its rows silently changes balances
+ * and lets an already-applied transfer be applied again.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-reset-ledger-test-"));
+const originalDataDir = process.env.DATA_DIR;
+process.env.DATA_DIR = tempDir;
+
+const { getDbInstance, resetDbInstance } = await import("../../src/lib/db/core.ts");
+const { resetUsageHistory } = await import("../../src/lib/db/cleanup.ts");
+const { getBalance, transferTokens } = await import("../../src/lib/db/gamification.ts");
+
+test.after(() => {
+  resetDbInstance();
+  if (originalDataDir !== undefined) {
+    process.env.DATA_DIR = originalDataDir;
+  } else {
+    delete process.env.DATA_DIR;
+  }
+  fs.rmSync(tempDir, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
+});
+
+function seedLedger() {
+  const db = getDbInstance();
+  db.prepare("DELETE FROM token_ledger").run();
+  const old = new Date(Date.now() - 3 * 24 * 60 * 60 * 1000).toISOString();
+  const insert = db.prepare(
+    "INSERT INTO token_ledger (from_api_key_id, to_api_key_id, amount, reason, idempotency_key, created_at) VALUES (?, ?, ?, ?, ?, ?)"
+  );
+  insert.run("system", "alice", 100, "grant", "grant-1", old);
+  insert.run("alice", "bob", 40, "share", "transfer-1", old);
+  return db;
+}
+
+for (const period of ["1d", "all"] as const) {
+  test(`resetUsageHistory("${period}") keeps token_ledger rows, balances and idempotency keys`, async () => {
+    const db = seedLedger();
+    assert.equal(getBalance("alice"), 60);
+
+    const result = await resetUsageHistory(period);
+
+    const rows = (db.prepare("SELECT COUNT(*) AS c FROM token_ledger").get() as { c: number }).c;
+    assert.equal(rows, 2, "the ledger must survive a usage reset");
+    assert.equal(getBalance("alice"), 60, "balances must not change");
+    assert.equal(getBalance("bob"), 40);
+    assert.equal(result.deletedTokenLedger, 0);
+
+    // A retry of an already-applied transfer must stay a no-op.
+    transferTokens("alice", "bob", 40, "share", "transfer-1");
+    assert.equal(getBalance("alice"), 60, "a retried transfer must not be applied twice");
+  });
+}