From 1e28544519e62ff17e2cc2949f745e3739d7876b Mon Sep 17 00:00:00 2001
From: Doris Benda <DOBEN@users.noreply.github.com>
Date: Wed, 3 Jan 2024 19:54:38 +0100
Subject: [PATCH] Clean up server

---
 .../backend/Cargo.lock                        | 523 +-----------------
 .../backend/Cargo.toml                        |  12 +-
 .../backend/src/main.rs                       |  99 ++--
 .../backend/src/types.rs                      |  66 ++-
 4 files changed, 105 insertions(+), 595 deletions(-)

diff --git a/sponsoredTransactionsAuction/backend/Cargo.lock b/sponsoredTransactionsAuction/backend/Cargo.lock
index 76d55fa3..1f7b4068 100644
--- a/sponsoredTransactionsAuction/backend/Cargo.lock
+++ b/sponsoredTransactionsAuction/backend/Cargo.lock
@@ -159,12 +159,6 @@ version = "1.0.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b13c32d80ecc7ab747b80c3784bce54ee8a7a0cc4fbda9bf4cda2cf6fe90854"
 
-[[package]]
-name = "array-init"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d62b7694a562cdf5a74227903507c56ab2cc8bdd1f781ed5cb4cf9c9f810bfc"
-
 [[package]]
 name = "arrayvec"
 version = "0.7.4"
@@ -173,9 +167,9 @@ checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
 [[package]]
 name = "async-compression"
-version = "0.4.2"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d495b6dc0184693324491a5ac05f559acc97bf937ab31d7a1c33dd0016be6d2b"
+checksum = "bc2d0cfb2a7388d34f590e76686704c494ed7aaceed62ee1ba35cbf363abc2a5"
 dependencies = [
  "brotli",
  "futures-core",
@@ -417,9 +411,9 @@ dependencies = [
 
 [[package]]
 name = "brotli"
-version = "3.3.4"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1a0b1dbcc8ae29329621f8d4f0d835787c1c38bb1401979b49d13b0b305ff68"
+checksum = "516074a47ef4bce09577a3b379392300159ce5b1ba2e501ff1c819950066100f"
 dependencies = [
  "alloc-no-stdlib",
  "alloc-stdlib",
@@ -428,9 +422,9 @@ dependencies = [
 
 [[package]]
 name = "brotli-decompressor"
-version = "2.3.4"
+version = "2.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b6561fd3f895a11e8f72af2cb7d22e08366bebc2b6b57f7744c4bda27034744"
+checksum = "4e2e4afe60d7dd600fdd3de8d0f08c2b7ec039712e3b6137ff98b7004e82de4f"
 dependencies = [
  "alloc-no-stdlib",
  "alloc-stdlib",
@@ -956,15 +950,6 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
-[[package]]
-name = "encoding_rs"
-version = "0.8.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "071a31f4ee85403370b58aca746f01041ede6f0da2730960ad001edc2b71b394"
-dependencies = [
- "cfg-if",
-]
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -992,18 +977,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "fallible-iterator"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
-
-[[package]]
-name = "fastrand"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
-
 [[package]]
 name = "ff"
 version = "0.5.2"
@@ -1035,21 +1008,6 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
-[[package]]
-name = "foreign-types"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
-dependencies = [
- "foreign-types-shared",
-]
-
-[[package]]
-name = "foreign-types-shared"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
-
 [[package]]
 name = "form_urlencoded"
 version = "1.2.0"
@@ -1232,20 +1190,6 @@ dependencies = [
  "tracing",
 ]
 
-[[package]]
-name = "handlebars"
-version = "4.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c39b3bc2a8f715298032cf5087e58573809374b08160aa7d750582bdb82d2683"
-dependencies = [
- "log",
- "pest",
- "pest_derive",
- "serde",
- "serde_json",
- "thiserror",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.11.2"
@@ -1360,7 +1304,7 @@ dependencies = [
  "httpdate",
  "itoa",
  "pin-project-lite",
- "socket2 0.4.9",
+ "socket2",
  "tokio",
  "tower-service",
  "tracing",
@@ -1379,19 +1323,6 @@ dependencies = [
  "tokio-io-timeout",
 ]
 
-[[package]]
-name = "hyper-tls"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6183ddfa99b85da61a140bea0efc93fdf56ceaa041b37d553518030827f9905"
-dependencies = [
- "bytes",
- "hyper",
- "native-tls",
- "tokio",
- "tokio-native-tls",
-]
-
 [[package]]
 name = "iana-time-zone"
 version = "0.1.57"
@@ -1421,16 +1352,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
-[[package]]
-name = "idna"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d20d6b07bfbc108882d88ed8e37d39636dcc260e15e30c45e6ba089610b917c"
-dependencies = [
- "unicode-bidi",
- "unicode-normalization",
-]
-
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -1462,12 +1383,6 @@ dependencies = [
  "generic-array",
 ]
 
-[[package]]
-name = "ipnet"
-version = "2.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28b29a3cd74f0f4598934efe3aeba42bae0eb4680554128851ebbecb02af14e6"
-
 [[package]]
 name = "is-terminal"
 version = "0.4.9"
@@ -1496,9 +1411,9 @@ checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
@@ -1545,16 +1460,6 @@ version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57bcfdad1b858c2db7c38303a6d2ad4dfaf5eb53dfeb0910128b2c26d6158503"
 
-[[package]]
-name = "lock_api"
-version = "0.4.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
-dependencies = [
- "autocfg",
- "scopeguard",
-]
-
 [[package]]
 name = "log"
 version = "0.4.19"
@@ -1567,15 +1472,6 @@ version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed1202b2a6f884ae56f04cff409ab315c5ce26b5e58d7412e484f01fd52f52ef"
 
-[[package]]
-name = "md-5"
-version = "0.10.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6365506850d44bff6e2fbcb5176cf63650e48bd45ef2fe2665ae1570e0f4b9ca"
-dependencies = [
- "digest 0.10.7",
-]
-
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -1633,24 +1529,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "native-tls"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07226173c32f2926027b63cce4bcd8076c3552846cbe7925f3aaffeac0a3b92e"
-dependencies = [
- "lazy_static",
- "libc",
- "log",
- "openssl",
- "openssl-probe",
- "openssl-sys",
- "schannel",
- "security-framework",
- "security-framework-sys",
- "tempfile",
-]
-
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -1810,50 +1688,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
-[[package]]
-name = "openssl"
-version = "0.10.55"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "345df152bc43501c5eb9e4654ff05f794effb78d4efe3d53abc158baddc0703d"
-dependencies = [
- "bitflags 1.3.2",
- "cfg-if",
- "foreign-types",
- "libc",
- "once_cell",
- "openssl-macros",
- "openssl-sys",
-]
-
-[[package]]
-name = "openssl-macros"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.28",
-]
-
 [[package]]
 name = "openssl-probe"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
-[[package]]
-name = "openssl-sys"
-version = "0.9.90"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "overload"
 version = "0.1.1"
@@ -1872,29 +1712,6 @@ dependencies = [
  "rand_core 0.5.1",
 ]
 
-[[package]]
-name = "parking_lot"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3742b2c103b9f06bc9fff0a37ff4912935851bee6d36f3c02bcc755bcfec228f"
-dependencies = [
- "lock_api",
- "parking_lot_core",
-]
-
-[[package]]
-name = "parking_lot_core"
-version = "0.9.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93f00c865fe7cabf650081affecd3871070f26767e7b2070a3ffae14c654b447"
-dependencies = [
- "cfg-if",
- "libc",
- "redox_syscall",
- "smallvec",
- "windows-targets",
-]
-
 [[package]]
 name = "password-hash"
 version = "0.4.2"
@@ -1924,69 +1741,6 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b2a4787296e9989611394c33f193f676704af1686e70b8f8033ab5ba9a35a94"
 
-[[package]]
-name = "pest"
-version = "2.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7a4d085fd991ac8d5b05a147b437791b4260b76326baf0fc60cf7c9c27ecd33"
-dependencies = [
- "memchr",
- "thiserror",
- "ucd-trie",
-]
-
-[[package]]
-name = "pest_derive"
-version = "2.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2bee7be22ce7918f641a33f08e3f43388c7656772244e2bbb2477f44cc9021a"
-dependencies = [
- "pest",
- "pest_generator",
-]
-
-[[package]]
-name = "pest_generator"
-version = "2.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1511785c5e98d79a05e8a6bc34b4ac2168a0e3e92161862030ad84daa223141"
-dependencies = [
- "pest",
- "pest_meta",
- "proc-macro2",
- "quote",
- "syn 2.0.28",
-]
-
-[[package]]
-name = "pest_meta"
-version = "2.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b42f0394d3123e33353ca5e1e89092e533d2cc490389f2bd6131c43c634ebc5f"
-dependencies = [
- "once_cell",
- "pest",
- "sha2 0.10.7",
-]
-
-[[package]]
-name = "phf"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ade2d8b8f33c7333b51bcf0428d37e217e9f32192ae4772156f65063b8ce03dc"
-dependencies = [
- "phf_shared",
-]
-
-[[package]]
-name = "phf_shared"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90fcb95eef784c2ac79119d1dd819e162b5da872ce6f3c3abe1e8ca1c082f72b"
-dependencies = [
- "siphasher",
-]
-
 [[package]]
 name = "pin-project"
 version = "1.1.2"
@@ -2021,9 +1775,9 @@ checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
 name = "pkg-config"
-version = "0.3.27"
+version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
+checksum = "69d3587f8a9e599cc7ec2c00e331f71c4e69a5f9a4b8a6efd5b07466b9736f9a"
 
 [[package]]
 name = "polyval"
@@ -2037,38 +1791,6 @@ dependencies = [
  "universal-hash",
 ]
 
-[[package]]
-name = "postgres-protocol"
-version = "0.6.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78b7fa9f396f51dffd61546fd8573ee20592287996568e6175ceb0f8699ad75d"
-dependencies = [
- "base64 0.21.2",
- "byteorder",
- "bytes",
- "fallible-iterator",
- "hmac",
- "md-5",
- "memchr",
- "rand 0.8.5",
- "sha2 0.10.7",
- "stringprep",
-]
-
-[[package]]
-name = "postgres-types"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f028f05971fe20f512bcc679e2c10227e57809a3af86a7606304435bc8896cd6"
-dependencies = [
- "array-init",
- "bytes",
- "fallible-iterator",
- "postgres-protocol",
- "serde",
- "serde_json",
-]
-
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -2273,15 +1995,6 @@ dependencies = [
  "num_cpus",
 ]
 
-[[package]]
-name = "redox_syscall"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
-dependencies = [
- "bitflags 1.3.2",
-]
-
 [[package]]
 name = "rend"
 version = "0.4.0"
@@ -2291,43 +2004,6 @@ dependencies = [
  "bytecheck",
 ]
 
-[[package]]
-name = "reqwest"
-version = "0.11.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cde824a14b7c14f85caff81225f411faacc04a2013f41670f41443742b1c1c55"
-dependencies = [
- "base64 0.21.2",
- "bytes",
- "encoding_rs",
- "futures-core",
- "futures-util",
- "h2",
- "http",
- "http-body",
- "hyper",
- "hyper-tls",
- "ipnet",
- "js-sys",
- "log",
- "mime",
- "native-tls",
- "once_cell",
- "percent-encoding",
- "pin-project-lite",
- "serde",
- "serde_json",
- "serde_urlencoded",
- "tokio",
- "tokio-native-tls",
- "tower-service",
- "url",
- "wasm-bindgen",
- "wasm-bindgen-futures",
- "web-sys",
- "winreg",
-]
-
 [[package]]
 name = "ring"
 version = "0.16.20"
@@ -2656,9 +2332,9 @@ dependencies = [
 
 [[package]]
 name = "sharded-slab"
-version = "0.1.4"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "900fba806f70c630b0a382d0d825e17a0f19fcd059a2ade1ff237bcddf446b31"
+checksum = "f40ca3c46823713e0d4209592e8d6e826aa57e928f09752619fc696c499637f6"
 dependencies = [
  "lazy_static",
 ]
@@ -2684,12 +2360,6 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f27f6278552951f1f2b8cf9da965d10969b2efdea95a6ec47987ab46edfe263a"
 
-[[package]]
-name = "siphasher"
-version = "0.3.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd3e3206899af3f8b12af284fafc038cc1dc2b41d1b89dd17297221c5d225de"
-
 [[package]]
 name = "slab"
 version = "0.4.8"
@@ -2701,9 +2371,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.11.0"
+version = "1.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
+checksum = "4dccd0940a2dcdf68d092b8cbab7dc0ad8fa938bf95787e1b916b0e3d0e8e970"
 
 [[package]]
 name = "socket2"
@@ -2715,16 +2385,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "socket2"
-version = "0.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2538b18701741680e0322a2302176d3253a35388e2e62f172f64f4f16605f877"
-dependencies = [
- "libc",
- "windows-sys",
-]
-
 [[package]]
 name = "spin"
 version = "0.5.2"
@@ -2738,35 +2398,19 @@ dependencies = [
  "anyhow",
  "axum",
  "axum-macros",
- "chrono",
  "clap",
  "concordium-rust-sdk",
  "futures",
- "handlebars",
  "hex",
  "http",
- "reqwest",
  "serde",
  "serde_json",
- "sha2 0.10.7",
  "thiserror",
  "tokio",
- "tokio-postgres",
  "tonic",
  "tower-http",
  "tracing",
  "tracing-subscriber",
- "url",
-]
-
-[[package]]
-name = "stringprep"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3737bde7edce97102e0e2b15365bf7a20bfdb5f60f4f9e8d7004258a51a8da"
-dependencies = [
- "unicode-bidi",
- "unicode-normalization",
 ]
 
 [[package]]
@@ -2815,19 +2459,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "tempfile"
-version = "3.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5486094ee78b2e5038a6382ed7645bc084dc2ec433426ca4c3cb61e2007b8998"
-dependencies = [
- "cfg-if",
- "fastrand",
- "redox_syscall",
- "rustix",
- "windows-sys",
-]
-
 [[package]]
 name = "thiserror"
 version = "1.0.44"
@@ -2926,7 +2557,7 @@ dependencies = [
  "num_cpus",
  "pin-project-lite",
  "signal-hook-registry",
- "socket2 0.4.9",
+ "socket2",
  "tokio-macros",
  "windows-sys",
 ]
@@ -2952,40 +2583,6 @@ dependencies = [
  "syn 2.0.28",
 ]
 
-[[package]]
-name = "tokio-native-tls"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbae76ab933c85776efabc971569dd6119c580d8f5d448769dec1764bf796ef2"
-dependencies = [
- "native-tls",
- "tokio",
-]
-
-[[package]]
-name = "tokio-postgres"
-version = "0.7.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e89f6234aa8fd43779746012fcf53603cdb91fdd8399aa0de868c2d56b6dde1"
-dependencies = [
- "async-trait",
- "byteorder",
- "bytes",
- "fallible-iterator",
- "futures-channel",
- "futures-util",
- "log",
- "parking_lot",
- "percent-encoding",
- "phf",
- "pin-project-lite",
- "postgres-protocol",
- "postgres-types",
- "socket2 0.5.3",
- "tokio",
- "tokio-util",
-]
-
 [[package]]
 name = "tokio-rustls"
 version = "0.23.4"
@@ -3187,20 +2784,20 @@ dependencies = [
 
 [[package]]
 name = "tracing-log"
-version = "0.1.3"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78ddad33d2d10b1ed7eb9d1f518a5674713876e97e5bb9b7345a7984fbb4f922"
+checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
 dependencies = [
- "lazy_static",
  "log",
+ "once_cell",
  "tracing-core",
 ]
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.17"
+version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30a651bc37f915e81f087d86e62a18eec5f79550c7faff886f7090b4ea757c77"
+checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
 dependencies = [
  "nu-ansi-term",
  "sharded-slab",
@@ -3222,42 +2819,21 @@ version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
 
-[[package]]
-name = "ucd-trie"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed646292ffc8188ef8ea4d1e0e0150fb15a5c2e12ad9b8fc191ae7a8a7f3c4b9"
-
 [[package]]
 name = "unicase"
-version = "2.6.0"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+checksum = "f7d2d4dafb69621809a81864c9c1b864479e1235c0dd4e199924b9742439ed89"
 dependencies = [
  "version_check",
 ]
 
-[[package]]
-name = "unicode-bidi"
-version = "0.3.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
-
 [[package]]
 name = "unicode-ident"
 version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
-[[package]]
-name = "unicode-normalization"
-version = "0.1.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
-dependencies = [
- "tinyvec",
-]
-
 [[package]]
 name = "universal-hash"
 version = "0.5.1"
@@ -3274,18 +2850,6 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
 
-[[package]]
-name = "url"
-version = "2.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "143b538f18257fac9cad154828a57c6bf5157e1aa604d4816b5995bf6de87ae5"
-dependencies = [
- "form_urlencoded",
- "idna",
- "percent-encoding",
- "serde",
-]
-
 [[package]]
 name = "utf8parse"
 version = "0.2.1"
@@ -3304,12 +2868,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
 
-[[package]]
-name = "vcpkg"
-version = "0.2.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
-
 [[package]]
 name = "version_check"
 version = "0.9.4"
@@ -3368,18 +2926,6 @@ dependencies = [
  "wasm-bindgen-shared",
 ]
 
-[[package]]
-name = "wasm-bindgen-futures"
-version = "0.4.37"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c02dbc21516f9f1f04f187958890d7e6026df8d16540b7ad9492bc34a67cea03"
-dependencies = [
- "cfg-if",
- "js-sys",
- "wasm-bindgen",
- "web-sys",
-]
-
 [[package]]
 name = "wasm-bindgen-macro"
 version = "0.2.87"
@@ -3535,15 +3081,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "winreg"
-version = "0.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "wyz"
 version = "0.5.1"
@@ -3575,30 +3112,28 @@ dependencies = [
 
 [[package]]
 name = "zstd"
-version = "0.12.4"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a27595e173641171fc74a1232b7b1c7a7cb6e18222c11e9dfb9888fa424c53c"
+checksum = "bffb3309596d527cfcba7dfc6ed6052f1d39dfbd7c867aa2e865e4a449c10110"
 dependencies = [
  "zstd-safe",
 ]
 
 [[package]]
 name = "zstd-safe"
-version = "6.0.6"
+version = "7.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee98ffd0b48ee95e6c5168188e44a54550b1564d9d530ee21d5f0eaed1069581"
+checksum = "43747c7422e2924c11144d5229878b98180ef8b06cca4ab5af37afc8a8d8ea3e"
 dependencies = [
- "libc",
  "zstd-sys",
 ]
 
 [[package]]
 name = "zstd-sys"
-version = "2.0.8+zstd.1.5.5"
+version = "2.0.9+zstd.1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5556e6ee25d32df2586c098bbfa278803692a20d0ab9565e049480d52707ec8c"
+checksum = "9e16efa8a874a0481a574084d34cc26fdb3b99627480f785888deb6386506656"
 dependencies = [
  "cc",
- "libc",
  "pkg-config",
 ]
diff --git a/sponsoredTransactionsAuction/backend/Cargo.toml b/sponsoredTransactionsAuction/backend/Cargo.toml
index eaf649fa..c6f5b62a 100644
--- a/sponsoredTransactionsAuction/backend/Cargo.toml
+++ b/sponsoredTransactionsAuction/backend/Cargo.toml
@@ -12,21 +12,15 @@ anyhow = "1.0"
 axum = "0.6"
 clap = { version = "4.3", features = ["derive", "env"] }
 serde_json = "1.0"
-tokio = { version = "1.29", features = ["rt-multi-thread", "macros", "signal"] }
-tokio-postgres = { version = "0.7", features = [
-  "with-serde_json-1",
-  "array-impls",
-] }
+tokio = { version = "1.29", features = ["rt-multi-thread", "signal"] }
 tracing = "0.1"
 tracing-subscriber = "0.3"
 serde = { version = "1.0", features = ["derive"] }
 futures = "0.3"
 axum-macros = "0.3"
-reqwest = { version = "0.11", features = ["json"] }
 tower-http = { version = "0.4", features = [
   "trace",
   "limit",
-  "cors",
   "timeout",
   "fs",
   "compression-br",
@@ -35,10 +29,6 @@ tower-http = { version = "0.4", features = [
 http = "0.2"
 tonic = { version = "0.8", features = ["tls-roots", "tls"] }
 thiserror = "1.0"
-chrono = { version = "0.4", features = ["serde"] }
-sha2 = "0.10"
-handlebars = "4.4"
-url = { version = "2.4.1", features = ["serde"] }
 hex = "0.4.3"
 
 [dependencies.concordium-rust-sdk]
diff --git a/sponsoredTransactionsAuction/backend/src/main.rs b/sponsoredTransactionsAuction/backend/src/main.rs
index 4e8a7f65..1ac9d802 100644
--- a/sponsoredTransactionsAuction/backend/src/main.rs
+++ b/sponsoredTransactionsAuction/backend/src/main.rs
@@ -22,10 +22,7 @@ use concordium_rust_sdk::{
         transactions, Energy, WalletAccount,
     },
     v2::{self, BlockIdentifier},
-    web3id::did::Network,
 };
-use handlebars::Handlebars;
-use serde_json::json;
 use std::{
     collections::{BTreeMap, HashMap},
     fs,
@@ -35,16 +32,15 @@ use tokio::sync::Mutex;
 use tonic::transport::ClientTlsConfig;
 use tower_http::services::ServeDir;
 
-const CONTRACT_NAME: &str = "cis2_multi";
-const ENERGY: u64 = 60000;
-const RATE_LIMIT_PER_ACCOUNT: u8 = 30;
-
 // Before submitting a transaction we simulate/dry-run the transaction to get an
 // estimate of the energy needed for executing the transaction. In addition, we
 // allow an additional small amount of energy `EPSILON_ENERGY` to be consumed by
 // the transaction to cover small variations (e.g. changes to the smart contract
 // state) caused by transactions that have been executed meanwhile.
 const EPSILON_ENERGY: u64 = 1000;
+const CONTRACT_NAME: &str = "cis2_multi";
+const ENERGY: u64 = 60000;
+const RATE_LIMIT_PER_ACCOUNT: u8 = 30;
 
 #[derive(clap::Parser, Debug)]
 #[clap(version, author)]
@@ -56,13 +52,6 @@ struct App {
         env = "NODE"
     )]
     endpoint: v2::Endpoint,
-    #[clap(
-        long = "network",
-        help = "Network to which the verifier is connected.",
-        default_value = "testnet",
-        env = "NETWORK"
-    )]
-    network: Network,
     #[clap(
         long = "log-level",
         default_value = "info",
@@ -163,54 +152,42 @@ async fn main() -> anyhow::Result<()> {
         .await
         .context("Unable to establish connection to the node.")?;
 
-    let http_client = reqwest::Client::new();
-
-    let crypto_params = node_client
-        .get_cryptographic_parameters(BlockIdentifier::LastFinal)
-        .await
-        .context("Unable to get cryptographic parameters.")?
-        .response;
-
-    // load account keys and sender address from a file
+    // Load account keys and sender address from a file
     let keys: WalletAccount = serde_json::from_str(
         &std::fs::read_to_string(app.keys_path).context("Could not read the keys file.")?,
     )
     .context("Could not parse the keys file.")?;
 
-    let key_transfer = Arc::new(keys);
-
-    // log::debug!("Acquire nonce of wallet account.");
+    let sponsorer_key = Arc::new(keys);
 
     let nonce_response = node_client
-        .get_next_account_sequence_number(&key_transfer.address)
+        .get_next_account_sequence_number(&sponsorer_key.address)
         .await
         .context("NonceQueryError.")?;
 
+    tracing::debug!(
+        "Starting server with sponsorer {:?}. Current sponsorer nonce: {:?}.",
+        sponsorer_key.address,
+        nonce_response
+    );
+
     let state = Server {
-        http_client,
         node_client,
         nonce: Arc::new(Mutex::new(nonce_response.nonce)),
         rate_limits: Arc::new(Mutex::new(HashMap::new())),
         auction_smart_contract: ContractAddress::new(app.auction_smart_contract_index, 0),
         cis2_token_smart_contract: ContractAddress::new(app.cis2_token_smart_contract_index, 0),
-        key: key_transfer,
-        network: app.network,
-        crypto_params: Arc::new(crypto_params),
+        key: sponsorer_key,
     };
 
-    // Render index.html with config
+    // Render index.html
     let index_template = fs::read_to_string(app.frontend_assets.join("index.html"))
-        .context("Frontend was not built.")?;
-    let mut reg = Handlebars::new();
-    // Prevent handlebars from escaping inserted object
-    reg.register_escape_fn(|s| s.into());
-
-    let index_html = reg.render_template(&index_template, &json!(""))?;
+        .context("Frontend was not built or wrong path to the frontend files.")?;
 
     tracing::info!("Starting server...");
     let serve_dir_service = ServeDir::new(app.frontend_assets.join("assets"));
     let router = Router::new()
-        .route("/", get(|| async { Html(index_html) }))
+        .route("/", get(|| async { Html(index_template) }))
         .nest_service("/assets", serve_dir_service)
         .route("/api/bid", post(handle_signature_bid))
         .route("/health", get(health))
@@ -243,7 +220,7 @@ async fn handle_signature_bid(
     State(mut state): State<Server>,
     request: Result<Json<BidParams>, JsonRejection>,
 ) -> Result<Json<TransactionHash>, ServerError> {
-    let request = request.map_err(ServerError::InvalidRequest)?;
+    let Json(request) = request?;
 
     tracing::debug!("Request: {:?}", request);
 
@@ -255,8 +232,8 @@ async fn handle_signature_bid(
             state.auction_smart_contract,
             OwnedReceiveName::new_unchecked("bid".to_owned()),
         ),
-        token_id: request.token_id.clone(),
-        amount:   request.token_amount.clone(),
+        token_id: request.token_id,
+        amount:   request.token_amount,
         data:     AdditionalData::new_unchecked(to_bytes(&request.item_index_auction)),
     };
 
@@ -264,7 +241,7 @@ async fn handle_signature_bid(
 
     tracing::debug!("Created payload: {:?}", payload);
 
-    tracing::debug!("Create PermitMessage ...");
+    tracing::debug!("Create permitMessage ...");
 
     let message: PermitMessage = PermitMessage {
         contract_address: state.cis2_token_smart_contract,
@@ -274,13 +251,12 @@ async fn handle_signature_bid(
         payload:          concordium_rust_sdk::smart_contracts::common::to_bytes(&payload),
     };
 
-    tracing::debug!("Create message {:?}", message);
+    tracing::debug!("Created {:?}", message);
 
     tracing::debug!("Create signature map ...");
 
     let mut signature = [0; 64];
-    hex::decode_to_slice(request.signature.clone(), &mut signature)
-        .map_err(ServerError::SignatureError)?;
+    hex::decode_to_slice(request.signature, &mut signature).map_err(ServerError::SignatureError)?;
 
     let mut inner_signature_map = BTreeMap::new();
     inner_signature_map.insert(0, Signature::Ed25519(SignatureEd25519(signature)));
@@ -305,18 +281,18 @@ async fn handle_signature_bid(
     let parameter = smart_contracts::OwnedParameter::from_serial(&param)
         .map_err(|_| ServerError::ParameterError)?;
 
-    tracing::debug!("Created parameter {:?}", parameter);
-
-    let receive_name =
-        smart_contracts::OwnedReceiveName::new_unchecked(format!("{}.permit", CONTRACT_NAME));
+    tracing::debug!("Created {:?}", parameter);
 
     tracing::debug!("Simulate transaction to check its validity ...");
 
     let payload = transactions::UpdateContractPayload {
-        amount: Amount::from_micro_ccd(0),
-        address: state.cis2_token_smart_contract,
-        receive_name,
-        message: parameter,
+        amount:       Amount::from_micro_ccd(0),
+        address:      state.cis2_token_smart_contract,
+        receive_name: smart_contracts::OwnedReceiveName::new_unchecked(format!(
+            "{}.permit",
+            CONTRACT_NAME
+        )),
+        message:      parameter,
     };
 
     let context = ContractContext::new_from_payload(
@@ -344,7 +320,10 @@ async fn handle_signature_bid(
             events: _,
             used_energy,
         } => {
-            tracing::debug!("TransactionSimulationSuccess with used energy: {:#?}.", used_energy);
+            tracing::debug!(
+                "TransactionSimulationSuccess with used energy: {:#?}.",
+                used_energy
+            );
             used_energy
         }
         InvokeContractResult::Failure {
@@ -359,8 +338,6 @@ async fn handle_signature_bid(
         }
     };
 
-    tracing::debug!("Create transaction ...");
-
     // Transaction should expiry after one hour.
     let transaction_expiry = TransactionTime::hours_after(1);
 
@@ -384,7 +361,7 @@ async fn handle_signature_bid(
     // that the server can be restarted and reload the rate_limit values from the
     // database.
 
-    tracing::debug!("Check rate limit ...");
+    tracing::debug!("Check rate limit of account {} ...", request.signer);
 
     let mut rate_limits = state.rate_limits.lock().await;
 
@@ -397,6 +374,8 @@ async fn handle_signature_bid(
 
     *limit += 1;
 
+    tracing::debug!("Create transaction ...");
+
     let tx = transactions::send::make_and_sign_transaction(
         &state.key.keys,
         state.key.address,
@@ -411,9 +390,9 @@ async fn handle_signature_bid(
         concordium_rust_sdk::types::transactions::Payload::Update { payload },
     );
 
-    let bi = transactions::BlockItem::AccountTransaction(tx);
+    tracing::debug!("Submit transaction {:?} ...", tx.clone());
 
-    tracing::debug!("Submit transaction ...");
+    let bi = transactions::BlockItem::AccountTransaction(tx);
 
     match state.node_client.send_block_item(&bi).await {
         Ok(hash) => {
diff --git a/sponsoredTransactionsAuction/backend/src/types.rs b/sponsoredTransactionsAuction/backend/src/types.rs
index 9160d5e7..2f15d957 100644
--- a/sponsoredTransactionsAuction/backend/src/types.rs
+++ b/sponsoredTransactionsAuction/backend/src/types.rs
@@ -8,9 +8,8 @@ use concordium_rust_sdk::{
             Timestamp,
         },
     },
-    types::{CryptographicParameters, Nonce, RejectReason, WalletAccount},
+    types::{Nonce, RejectReason, WalletAccount},
     v2::{self, QueryError, RPCError},
-    web3id::did::Network,
 };
 use hex::FromHexError;
 use http::StatusCode;
@@ -21,31 +20,44 @@ use tokio::sync::Mutex;
 pub enum ServerError {
     #[error("Unable to parse request: {0}")]
     InvalidRequest(#[from] JsonRejection),
-    #[error("The passed signature from the front end is in a wrong format: {0}")]
+    #[error("Unable to parse signature into a hex string: {0}")]
     SignatureError(#[from] FromHexError),
-    #[error("TODO:ParameterError.")]
+    #[error("Unable to create parameter.")]
     ParameterError,
-    #[error("TODO: SimulationInvokeError: {0}")]
+    #[error("Unable to invoke the node to simulate the transaction: {0}")]
     SimulationInvokeError(#[from] QueryError),
-    #[error("TODO: Transaction simulation error.")]
+    #[error("Simulation of transaction reverted in smart contract with reason: {0:?}")]
     TransactionSimulationError(RevertReason),
-    #[error("TODO: RateLimitError.")]
+    #[error("The signer account reached its rate limit.")]
     RateLimitError,
-    #[error("TODO: SubmitSponsoredTransactionError: {0}")]
+    #[error("Unable to submit transaction on chain successfully: {0}")]
     SubmitSponsoredTransactionError(#[from] RPCError),
 }
 
-// TODO: Assign correct error codes to errors.
 impl axum::response::IntoResponse for ServerError {
     fn into_response(self) -> axum::response::Response {
         let r = match self {
-            // Error::CredentialLookup(e) => {
-            //     tracing::debug!("Failed to look up credential: {e}");
-            //     (
-            //         StatusCode::NOT_FOUND,
-            //         Json(format!("One or more credentials were not found: {e}")),
-            //     )
-            // }
+            ServerError::ParameterError => {
+                tracing::error!("Internal error: Unable to create parameter.");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json("Unable to create parameter.".to_string()),
+                )
+            }
+            ServerError::SimulationInvokeError(error) => {
+                tracing::error!("Internal error: {error}");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(format!("{}", error)),
+                )
+            }
+            ServerError::SubmitSponsoredTransactionError(error) => {
+                tracing::error!("Internal error: {error}");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(format!("{}", error)),
+                )
+            }
             error => {
                 tracing::debug!("Bad request: {error}");
                 (StatusCode::BAD_REQUEST, Json(format!("{}", error)))
@@ -55,21 +67,13 @@ impl axum::response::IntoResponse for ServerError {
     }
 }
 
+/// Struct to store the revert reason.
 #[derive(serde::Serialize, Debug)]
 pub struct RevertReason {
+    /// Smart contract revert reason.
     pub reason: RejectReason,
 }
 
-#[derive(serde::Serialize)]
-/// Response in case of an error. This is going to be encoded as a JSON body
-/// with fields 'code' and 'message'.
-pub struct ErrorResponse {
-    /// Code of the error.
-    pub code:    u16,
-    /// Error message.
-    pub message: String,
-}
-
 /// Paramters passed from the front end to this back end when calling the API
 /// endpoint `/bid`.
 #[derive(serde::Deserialize, serde::Serialize, Debug, Clone)]
@@ -133,16 +137,18 @@ pub struct PermitMessage {
     pub payload:          Vec<u8>,
 }
 
-/// Server struct to keep track of the nonce of the sponsorer account and the
+/// Server struct to store the contract addresses, the node client,
+/// the nonce and key of the sponsorer account, and the
 /// rate_limits of user accounts.
 #[derive(Clone, Debug)]
 pub struct Server {
-    pub http_client: reqwest::Client,
+    /// Client to interact with the node.
     pub node_client: v2::Client,
-    pub network: Network,
+    /// Key and address of the sponsorer account.
     pub key: Arc<WalletAccount>,
-    pub crypto_params: Arc<CryptographicParameters>,
+    /// Contract address of the auction contract.
     pub auction_smart_contract: ContractAddress,
+    /// Contract address of the token contract.
     pub cis2_token_smart_contract: ContractAddress,
     /// Nonce of the sponsorer account.
     pub nonce: Arc<Mutex<Nonce>>,