diff --git a/backend/Cargo.lock b/backend/Cargo.lock
index 4c056b3..0eb1c28 100644
--- a/backend/Cargo.lock
+++ b/backend/Cargo.lock
@@ -481,6 +481,7 @@ dependencies = [
  "lettre",
  "libsodium-sys-stable",
  "log",
+ "lru",
  "num_cpus",
  "rand",
  "rand_core",
@@ -1159,6 +1160,12 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "foldhash"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f81ec6369c545a7d40e4589b5597581fa1c441fe1cce96dd1de43159910a36a2"
+
 [[package]]
 name = "foreign-types"
 version = "0.3.2"
@@ -1371,6 +1378,11 @@ name = "hashbrown"
 version = "0.15.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf151400ff0baff5465007dd2f3e717f3fe502074ca563069ce3a6629d07b289"
+dependencies = [
+ "allocator-api2",
+ "equivalent",
+ "foldhash",
+]
 
 [[package]]
 name = "heapless"
@@ -1872,6 +1884,15 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
+[[package]]
+name = "lru"
+version = "0.12.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "234cf4f4a04dc1f57e24b96cc0cd600cf2af460d4161ac5ecdd0af8e1f3b2a38"
+dependencies = [
+ "hashbrown 0.15.2",
+]
+
 [[package]]
 name = "managed"
 version = "0.8.0"
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index c043c72..7bda64e 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -46,6 +46,7 @@ smoltcp = "0.11.0"
 bs58 = "0.5.1"
 askama = "0.12.1"
 actix-governor = {version = "0.8.0", features = ["log"]}
+lru = "0.12.5"
 
 [dev-dependencies]
 libsodium-sys-stable = "1.20.4"