diff --git a/changelog.d/fixes/10873-mimocode-retirement-state-cleanup.md b/changelog.d/fixes/10873-mimocode-retirement-state-cleanup.md
new file mode 100644
index 0000000000..44443eac6c
--- /dev/null
+++ b/changelog.d/fixes/10873-mimocode-retirement-state-cleanup.md
@@ -0,0 +1 @@
+- **fix(db):** Remove stale MiMoCode provider configuration, including the legacy `mcode` alias, left after provider retirement while preserving historical usage and call logs ([#10873](https://github.com/diegosouzapw/OmniRoute/pull/10873)) — thanks @Zartharas
diff --git a/src/lib/db/migrations/159_remove_mimocode_provider.sql b/src/lib/db/migrations/159_remove_mimocode_provider.sql
new file mode 100644
index 0000000000..1775d31333
--- /dev/null
+++ b/src/lib/db/migrations/159_remove_mimocode_provider.sql
@@ -0,0 +1,22 @@
+-- 159_remove_mimocode_provider.sql
+-- MiMoCode was removed from OmniRoute, but installations that configured it
+-- before removal can retain provider-scoped state. Remove that stale
+-- configuration for both the canonical provider id and its historical alias.
+--
+-- Historical request, usage, and call-log records are intentionally preserved.
+
+DELETE FROM provider_connections
+WHERE provider IN ('mimocode', 'mcode');
+
+DELETE FROM registered_keys
+WHERE provider IN ('mimocode', 'mcode');
+
+DELETE FROM provider_key_limits
+WHERE provider IN ('mimocode', 'mcode');
+
+DELETE FROM discovery_results
+WHERE provider_id IN ('mimocode', 'mcode');
+
+DELETE FROM key_value
+WHERE namespace = 'customModels'
+  AND key IN ('mimocode', 'mcode');
diff --git a/tests/unit/migration-159-remove-mimocode-provider.test.ts b/tests/unit/migration-159-remove-mimocode-provider.test.ts
new file mode 100644
index 0000000000..ce62675fde
--- /dev/null
+++ b/tests/unit/migration-159-remove-mimocode-provider.test.ts
@@ -0,0 +1,158 @@
+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 TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-mimocode-retirement-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const core = await import("../../src/lib/db/core.ts");
+
+test.after(() => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+});
+
+test("migration 159 removes stale MiMoCode provider state and is idempotent", () => {
+  const db = core.getDbInstance();
+
+  const applied = db
+    .prepare("SELECT version FROM _omniroute_migrations WHERE version = 159")
+    .get() as { version: number } | undefined;
+
+  assert.ok(applied, "migration 159 must be recorded as applied");
+
+  for (const provider of ["mimocode", "mcode"]) {
+    db.prepare(
+      "INSERT INTO provider_connections " +
+        "(id, provider, auth_type, name, is_active, created_at, updated_at) " +
+        "VALUES (?, ?, ?, ?, 1, datetime('now'), datetime('now'))"
+    ).run(`${provider}-connection`, provider, "apikey", `${provider}-legacy`);
+
+    db.prepare(
+      "INSERT INTO registered_keys " +
+        "(id, key, key_prefix, name, provider, account_id) " +
+        "VALUES (?, ?, ?, ?, ?, ?)"
+    ).run(
+      `${provider}-key-id`,
+      `${provider}-key-hash`,
+      `${provider.slice(0, 8)}`,
+      `${provider}-key`,
+      provider,
+      `${provider}-account`
+    );
+
+    db.prepare("INSERT INTO provider_key_limits (provider) VALUES (?)").run(provider);
+
+    db.prepare(
+      "INSERT INTO discovery_results " +
+        "(provider_id, method, endpoint, auth_type) " +
+        "VALUES (?, 'public_api', ?, 'api_key')"
+    ).run(provider, `https://${provider}.example.invalid/v1`);
+
+    db.prepare(
+      "INSERT INTO key_value (namespace, key, value) " + "VALUES ('customModels', ?, '[]')"
+    ).run(provider);
+
+    db.prepare(
+      "INSERT INTO usage_history (provider, model, timestamp) " +
+        "VALUES (?, 'legacy-model', datetime('now'))"
+    ).run(provider);
+
+    db.prepare(
+      "INSERT INTO call_logs (id, timestamp, provider, model, status) " +
+        "VALUES (?, datetime('now'), ?, 'legacy-model', 200)"
+    ).run(`${provider}-historical-call`, provider);
+  }
+
+  db.prepare(
+    "INSERT INTO provider_connections " +
+      "(id, provider, auth_type, name, is_active, created_at, updated_at) " +
+      "VALUES ('openai-control', 'openai', 'apikey', 'control', 1, datetime('now'), datetime('now'))"
+  ).run();
+
+  db.prepare(
+    "INSERT INTO registered_keys " +
+      "(id, key, key_prefix, name, provider, account_id) " +
+      "VALUES ('openai-key-id', 'openai-key-hash', 'openai', 'control', 'openai', 'control-account')"
+  ).run();
+
+  db.prepare("INSERT INTO provider_key_limits (provider) VALUES ('openai')").run();
+
+  db.prepare(
+    "INSERT INTO discovery_results " +
+      "(provider_id, method, endpoint, auth_type) " +
+      "VALUES ('openai', 'public_api', 'https://openai.example.invalid/v1', 'api_key')"
+  ).run();
+
+  db.prepare(
+    "INSERT INTO key_value (namespace, key, value) " + "VALUES ('customModels', 'openai', '[]')"
+  ).run();
+
+  const sql = fs.readFileSync(
+    path.join(process.cwd(), "src/lib/db/migrations/159_remove_mimocode_provider.sql"),
+    "utf8"
+  );
+
+  db.exec(sql);
+  db.exec(sql);
+
+  for (const provider of ["mimocode", "mcode"]) {
+    assert.equal(
+      db.prepare("SELECT id FROM provider_connections WHERE provider = ?").get(provider),
+      undefined,
+      `${provider} provider_connections rows must be deleted`
+    );
+
+    assert.equal(
+      db.prepare("SELECT id FROM registered_keys WHERE provider = ?").get(provider),
+      undefined,
+      `${provider} registered_keys rows must be deleted`
+    );
+
+    assert.equal(
+      db.prepare("SELECT provider FROM provider_key_limits WHERE provider = ?").get(provider),
+      undefined,
+      `${provider} provider_key_limits rows must be deleted`
+    );
+
+    assert.equal(
+      db.prepare("SELECT id FROM discovery_results WHERE provider_id = ?").get(provider),
+      undefined,
+      `${provider} discovery_results rows must be deleted`
+    );
+
+    assert.equal(
+      db
+        .prepare("SELECT key FROM key_value WHERE namespace = 'customModels' AND key = ?")
+        .get(provider),
+      undefined,
+      `${provider} custom models must be deleted`
+    );
+
+    assert.ok(
+      db.prepare("SELECT id FROM usage_history WHERE provider = ?").get(provider),
+      `${provider} historical usage must be preserved`
+    );
+
+    assert.ok(
+      db.prepare("SELECT id FROM call_logs WHERE provider = ?").get(provider),
+      `${provider} historical call logs must be preserved`
+    );
+  }
+
+  assert.ok(db.prepare("SELECT id FROM provider_connections WHERE provider = 'openai'").get());
+
+  assert.ok(db.prepare("SELECT id FROM registered_keys WHERE provider = 'openai'").get());
+
+  assert.ok(db.prepare("SELECT provider FROM provider_key_limits WHERE provider = 'openai'").get());
+
+  assert.ok(db.prepare("SELECT id FROM discovery_results WHERE provider_id = 'openai'").get());
+
+  assert.ok(
+    db
+      .prepare("SELECT key FROM key_value WHERE namespace = 'customModels' AND key = 'openai'")
+      .get()
+  );
+});