depricate use of ghc8.10

.github/PULL_REQUEST_TEMPLATE.md

@@ -8,7 +8,7 @@ Add your description here, if it fixes a particular issue please provide a [link
 - [ ] Commits have useful messages
 - [ ] New tests are added if needed and existing tests are updated
 - [ ] Any changes are noted in the [changelog](https://github.com/IntersectMBO/cardano-db-sync/blob/master/db-sync/CHANGELOG.md)
-- [ ] Code is formatted with [`fourmolu`](https://github.com/fourmolu/fourmolu) on version 0.10.1.0 (which can be run with `scripts/fourmolize.sh`)
+- [ ] Code is formatted with [`fourmolu`](https://github.com/fourmolu/fourmolu) on version 0.16.2.0 (which can be run with `scripts/fourmolize.sh`)
 - [ ] Self-reviewed the diff
 
 # Migrations

.github/workflows/check-fourmolu.yml

@@ -18,4 +18,4 @@ jobs:
       - name: Run fourmolu
         uses: haskell-actions/run-fourmolu@v9
         with:
-          version: "0.10.1.0"
+          version: "0.16.2.0"

.github/workflows/check-hlint.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up HLint
         uses: rwe/actions-hlint-setup@v1
         with:
-          version: "3.2.7"
+          version: "3.8"
 
       - name: Run HLint
         uses: rwe/actions-hlint-run@v2

.github/workflows/haskell.yml

@@ -20,7 +20,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # TODO: Add ghc910 when input-output-hk/devx is fixed
-        compiler-nix-name: [ghc810, ghc96, ghc98]
+        compiler-nix-name: [ghc96, ghc98]
         include:
           # We want a single job, because macOS runners are scarce.
           - os: macos-latest

doc/building-running.md

@@ -100,7 +100,7 @@ If building locally, to find `cardano-db-sync` executable location use:
 
 ```
 find . -name cardano-db-sync -executable -type f
-./dist-newstyle/build/x86_64-linux/ghc-8.10.4/cardano-db-sync-12.0.0/build/cardano-db-sync/cardano-db-sync
+./dist-newstyle/build/x86_64-linux/ghc-9.6.5/cardano-db-sync-12.0.0/build/cardano-db-sync/cardano-db-sync
 ```
 
 On macOS `brew install postgresl [email protected]` and extend PKG_CONFIG_PATH with

doc/installing.md

@@ -11,8 +11,8 @@ This guide assumes you have the following tools:
 
 In addition, Cardano DB Sync requires the following software (instructions below):
 
- * [GHC](https://www.haskell.org/ghcup/install/) >= 8.10.7
- * [Cabal](https://www.haskell.org/ghcup/install/) >= 3.10.1.0
+ * [GHC](https://www.haskell.org/ghcup/install/) >= 9.6.5
+ * [Cabal](https://www.haskell.org/ghcup/install/) >= 3.12.1.0
  * [libsodium-vrf](https://github.com/IntersectMBO/libsodium)
  * [secp256k1](https://github.com/bitcoin-core/secp256k1)
  * [blst](https://github.com/supranational/blst)
@@ -41,10 +41,10 @@ dependencies.
 Once GHCup is installed, open a new terminal (to get an updated environment) and run:
 
 ```bash
-ghcup install ghc 8.10.7
-ghcup install cabal 3.10.1.0
-ghcup set ghc 8.10.7
-ghcup set cabal 3.10.1.0
+ghcup install ghc 9.6.5
+ghcup install cabal 3.12.1.0
+ghcup set ghc 9.6.5
+ghcup set cabal 3.12.1.0
 ```
 
 Check that you will use the GHCup tools (and not any other installation on the system):
@@ -235,7 +235,7 @@ Explicitly set the GHC version that we installed earlier. This avoids defaulting
 system version of GHC that might be different than the one you have installed.
 
 ```bash
-echo "with-compiler: ghc-8.10.7" >> cabal.project.local
+echo "with-compiler: ghc-9.6.5" >> cabal.project.local
 ```
 
 macOS installs OpenSSL in a different location than expected by default. If you have

flake.nix

@@ -67,19 +67,15 @@
                   })
 
                 (final: prev: {
-                  # HLint 3.2.x requires GHC >= 8.10 && < 9.0
-                  hlint = final.haskell-nix.tool "ghc8107" "hlint" {
-                    version = "3.2.7";
+                  hlint = final.haskell-nix.tool "ghc96" "hlint" {
+                    version = "3.8";
                   };
 
-                  # Fourmolu 0.10.x requires GHC >= 9.0 && < 9.6
-                  fourmolu = final.haskell-nix.tool "ghc928" "fourmolu" {
-                    version = "0.10.1.0";
+                  fourmolu = final.haskell-nix.tool "ghc96" "fourmolu" {
+                    version = "0.16.2.0";
                   };
-
-                  # Weeder 2.2.0 requires GHC >= 8.10 && < 9.0
-                  weeder = final.haskell-nix.tool "ghc8107" "weeder" {
-                    version = "2.2.0";
+                  weeder = final.haskell-nix.tool "ghc96" "weeder" {
+                    version = "2.9.0";
                   };
                 })
 
@@ -141,10 +137,7 @@
           project = (nixpkgs.haskell-nix.cabalProject' ({ config, lib, pkgs, ... }: rec {
             src = ./.;
             name = "cardano-db-sync";
-            compiler-nix-name =
-              if system == "x86_64-linux"
-                then lib.mkDefault "ghc810"
-                else lib.mkDefault "ghc96";
+            compiler-nix-name = lib.mkDefault "ghc96";
             flake.variants =
               let
                 compilers =
@@ -168,11 +161,7 @@
             shell.tools = {
               cabal = "latest";
               haskell-language-server = {
-                src =
-                  if config.compiler-nix-name == "ghc8107" then
-                    nixpkgs.haskell-nix.sources."hls-1.10"
-                  else
-                    nixpkgs.haskell-nix.sources."hls-2.9";
+                src = nixpkgs.haskell-nix.sources."hls-2.9";
               };
             };
             # Now we use pkgsBuildBuild, to make sure that even in the cross
@@ -181,7 +170,7 @@
             shell.buildInputs = with nixpkgs.pkgsBuildBuild; [
               gitAndTools.git
               hlint
-            ] ++ lib.optionals (config.compiler-nix-name == "ghc8107") [
+            ] ++ lib.optionals (config.compiler-nix-name == "ghc96") [
               # Weeder requires the GHC version to match HIE files
               weeder
             ] ++ lib.optionals (system != "aarch64-darwin") [