diff --git a/users/Profpatsch/arglib/ArglibNetencode.hs b/users/Profpatsch/arglib/ArglibNetencode.hs
index e4609d26a..4531151ca 100644
--- a/users/Profpatsch/arglib/ArglibNetencode.hs
+++ b/users/Profpatsch/arglib/ArglibNetencode.hs
@@ -1,20 +1,17 @@
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
 
 module ArglibNetencode where
 
-import qualified Data.Attoparsec.ByteString as Atto
-import Data.Maybe (fromMaybe)
+import Data.Attoparsec.ByteString qualified as Atto
 import ExecHelpers
-import MyPrelude
-import Netencode
-import qualified System.Environment as Env
-import qualified System.Posix.Env.ByteString as ByteEnv
+import Label
+import Netencode qualified
+import PossehlAnalyticsPrelude
+import System.Posix.Env.ByteString qualified as ByteEnv
 
-arglibNetencode :: CurrentProgramName -> Maybe Text -> IO T
+arglibNetencode :: CurrentProgramName -> Maybe (Label "arglibEnvvar" Text) -> IO Netencode.T
 arglibNetencode progName mEnvvar = do
-  let envvar = mEnvvar & fromMaybe "ARGLIB_NETENCODE" & textToBytesUtf8
+  let envvar = mEnvvar <&> (.arglibEnvvar) & fromMaybe "ARGLIB_NETENCODE" & textToBytesUtf8
   ByteEnv.getEnv envvar >>= \case
     Nothing -> dieUserError progName [fmt|could not read args, envvar {envvar} not set|]
     Just bytes ->
diff --git a/users/Profpatsch/arglib/arglib-netencode.cabal b/users/Profpatsch/arglib/arglib-netencode.cabal
index d9a049247..42b524f40 100644
--- a/users/Profpatsch/arglib/arglib-netencode.cabal
+++ b/users/Profpatsch/arglib/arglib-netencode.cabal
@@ -1,17 +1,65 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               arglib-netencode
 version:            0.1.0.0
 author:             Profpatsch
 maintainer:         mail@profpatsch.de
 
+common common-options
+  ghc-options:
+      -Wall
+      -Wno-type-defaults
+      -Wunused-packages
+      -Wredundant-constraints
+      -fwarn-missing-deriving-strategies
+
+  -- See https://downloads.haskell.org/ghc/latest/docs/users_guide/exts.html
+  -- for a description of all these extensions
+  default-extensions:
+      -- Infer Applicative instead of Monad where possible
+    ApplicativeDo
+
+    -- Allow literal strings to be Text
+    OverloadedStrings
+
+    -- Syntactic sugar improvements
+    LambdaCase
+    MultiWayIf
+
+    -- Makes the (deprecated) usage of * instead of Data.Kind.Type an error
+    NoStarIsType
+
+    -- Convenient and crucial to deal with ambiguous field names, commonly
+    -- known as RecordDotSyntax
+    OverloadedRecordDot
+
+    -- does not export record fields as functions, use OverloadedRecordDot to access instead
+    NoFieldSelectors
+
+    -- Record punning
+    RecordWildCards
+
+    -- Improved Deriving
+    DerivingStrategies
+    DerivingVia
+
+    -- Type-level strings
+    DataKinds
+
+    -- to enable the `type` keyword in import lists (ormolu uses this automatically)
+    ExplicitNamespaces
+
+  default-language: GHC2021
+
+
 library
+    import: common-options
     exposed-modules:          ArglibNetencode
 
     build-depends:
         base >=4.15 && <5,
-        my-prelude,
+        pa-prelude,
+        pa-label,
         netencode,
         exec-helpers,
         attoparsec,
         unix
-    default-language: Haskell2010
diff --git a/users/Profpatsch/arglib/netencode.nix b/users/Profpatsch/arglib/netencode.nix
index 88bad97a3..83a94ddd6 100644
--- a/users/Profpatsch/arglib/netencode.nix
+++ b/users/Profpatsch/arglib/netencode.nix
@@ -57,7 +57,9 @@ let
     ];
 
     libraryHaskellDepends = [
-      depot.users.Profpatsch.my-prelude
+      pkgs.haskellPackages.pa-prelude
+      pkgs.haskellPackages.pa-label
+      pkgs.haskellPackages.pa-error-tree
       depot.users.Profpatsch.netencode.netencode-hs
       depot.users.Profpatsch.execline.exec-helpers-hs
     ];
diff --git a/users/Profpatsch/cabal.project b/users/Profpatsch/cabal.project
index d82af89d5..900fd457d 100644
--- a/users/Profpatsch/cabal.project
+++ b/users/Profpatsch/cabal.project
@@ -1,3 +1,8 @@
 packages:
   ./my-prelude/my-prelude.cabal
+  ./netencode/netencode.cabal
+  ./arglib/arglib-netencode.cabal
+  ./execline/exec-helpers.cabal
   ./htmx-experiment/htmx-experiment.cabal
+  ./cas-serve/cas-serve.cabal
+  ./jbovlaste-sqlite/jbovlaste-sqlite.cabal
diff --git a/users/Profpatsch/cas-serve/CasServe.hs b/users/Profpatsch/cas-serve/CasServe.hs
index f7189d5f9..62636fe9c 100644
--- a/users/Profpatsch/cas-serve/CasServe.hs
+++ b/users/Profpatsch/cas-serve/CasServe.hs
@@ -1,16 +1,9 @@
-{-# LANGUAGE DataKinds #-}
-{-# LANGUAGE DerivingStrategies #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE OverloadedRecordDot #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
-{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE TypeApplications #-}
-{-# OPTIONS_GHC -Wall #-}
 {-# OPTIONS_GHC -Wno-orphans #-}
 
 module Main where
 
+import ArglibNetencode (arglibNetencode)
 import Control.Applicative
 import Control.Monad.Reader
 import Crypto.Hash qualified as Crypto
@@ -20,7 +13,6 @@ import Data.ByteString.Lazy qualified as Lazy
 import Data.Functor.Compose
 import Data.Int (Int64)
 import Data.List qualified as List
-import Data.Maybe (fromMaybe)
 import Data.Text qualified as Text
 import Data.Text.IO qualified as Text
 import Database.SQLite.Simple (NamedParam ((:=)))
@@ -28,12 +20,29 @@ import Database.SQLite.Simple qualified as Sqlite
 import Database.SQLite.Simple.FromField qualified as Sqlite
 import Database.SQLite.Simple.QQ qualified as Sqlite
 import Label
-import MyPrelude
+import Netencode.Parse qualified as Net
 import Network.HTTP.Types qualified as Http
 import Network.Wai qualified as Wai
 import Network.Wai.Handler.Warp qualified as Warp
+import PossehlAnalyticsPrelude
 import System.IO (stderr)
 
+parseArglib = do
+  let env = label @"arglibEnvvar" "CAS_SERVE_ARGS"
+  let asApi =
+        Net.asRecord >>> do
+          address <- label @"bindToAddress" <$> (Net.key "bindToAddress" >>> Net.asText)
+          port <- label @"port" <$> (Net.key "port" >>> Net.asText)
+          pure (T2 address port)
+  arglibNetencode "cas-serve" (Just env)
+    <&> Net.runParse
+      [fmt|Cannot parse arguments in "{env.arglibEnvvar}"|]
+      ( Net.asRecord >>> do
+          publicApi <- label @"publicApi" <$> (Net.key "publicApi" >>> asApi)
+          privateApi <- label @"privateApi" <$> (Net.key "privateApi" >>> asApi)
+          pure $ T2 publicApi privateApi
+      )
+
 main :: IO ()
 main = do
   withEnv $ \env ->
@@ -64,8 +73,7 @@ api env req respond = do
             Wai.responseLBS
               Http.status200
               headers
-              ( body & toLazyBytes
-              )
+              (body & toLazyBytes)
 
 data Env = Env
   { envWordlist :: Sqlite.Connection,
@@ -102,7 +110,7 @@ getById = handler $ \(req, env) -> do
              "size"
              Int
          )
-        (env & envData)
+        (env.envData)
         [Sqlite.sql|
         SELECT
           mimetype,
@@ -172,7 +180,7 @@ insertById = handler $ \(req, env) -> do
       name <- getNameFromWordlist env
       let fullname = name <> extension
 
-      let conn = env & envData
+      let conn = env.envData
       Sqlite.withTransaction conn $ do
         Sqlite.executeNamed
           conn
@@ -218,7 +226,7 @@ getNameFromWordlist env =
   do
     let numberOfWords = 3 :: Int
     Sqlite.queryNamed @(Sqlite.Only Text)
-      (env & envWordlist)
+      (env.envWordlist)
       [Sqlite.sql|SELECT word FROM wordlist ORDER BY RANDOM() LIMIT :words|]
       [":words" Sqlite.:= numberOfWords]
     <&> map Sqlite.fromOnly
diff --git a/users/Profpatsch/cas-serve/cas-serve.cabal b/users/Profpatsch/cas-serve/cas-serve.cabal
index 3d988e422..82db1f5fd 100644
--- a/users/Profpatsch/cas-serve/cas-serve.cabal
+++ b/users/Profpatsch/cas-serve/cas-serve.cabal
@@ -1,23 +1,74 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               cas-serve
 version:            0.1.0.0
 author:             Profpatsch
 maintainer:         mail@profpatsch.de
 
+common common-options
+  ghc-options:
+      -Wall
+      -Wno-type-defaults
+      -Wunused-packages
+      -Wredundant-constraints
+      -fwarn-missing-deriving-strategies
+
+  -- See https://downloads.haskell.org/ghc/latest/docs/users_guide/exts.html
+  -- for a description of all these extensions
+  default-extensions:
+      -- Infer Applicative instead of Monad where possible
+    ApplicativeDo
+
+    -- Allow literal strings to be Text
+    OverloadedStrings
+
+    -- Syntactic sugar improvements
+    LambdaCase
+    MultiWayIf
+
+    -- Makes the (deprecated) usage of * instead of Data.Kind.Type an error
+    NoStarIsType
+
+    -- Convenient and crucial to deal with ambiguous field names, commonly
+    -- known as RecordDotSyntax
+    OverloadedRecordDot
+
+    -- does not export record fields as functions, use OverloadedRecordDot to access instead
+    NoFieldSelectors
+
+    -- Record punning
+    RecordWildCards
+
+    -- Improved Deriving
+    DerivingStrategies
+    DerivingVia
+
+    -- Type-level strings
+    DataKinds
+
+    -- to enable the `type` keyword in import lists (ormolu uses this automatically)
+    ExplicitNamespaces
+
+  default-language: GHC2021
+
+
 executable cas-serve
+    import: common-options
+
     main-is:          CasServe.hs
 
     build-depends:
         base >=4.15 && <5,
+        pa-prelude,
+        pa-label,
+        arglib-netencode,
+        netencode,
         text,
         sqlite-simple,
         http-types,
+        ihp-hsx,
         wai,
         warp,
         mtl,
-        my-prelude,
         bytestring,
         memory,
         cryptonite,
-
-    default-language: Haskell2010
diff --git a/users/Profpatsch/cas-serve/default.nix b/users/Profpatsch/cas-serve/default.nix
index 6e4bfd324..1b4fbe03e 100644
--- a/users/Profpatsch/cas-serve/default.nix
+++ b/users/Profpatsch/cas-serve/default.nix
@@ -1,17 +1,38 @@
 { depot, pkgs, lib, ... }:
 
 let
-  cas-serve = pkgs.writers.writeHaskell "cas-serve"
-    {
-      libraries = [
-        pkgs.haskellPackages.wai
-        pkgs.haskellPackages.warp
-        pkgs.haskellPackages.sqlite-simple
-        depot.users.Profpatsch.my-prelude
-      ];
-      ghcArgs = [ "-threaded" ];
+  bins = depot.nix.getBins pkgs.sqlite [ "sqlite3" ];
 
-    } ./CasServe.hs;
+  cas-serve = pkgs.haskellPackages.mkDerivation {
+    pname = "cas-serve";
+    version = "0.1.0";
 
+    src = depot.users.Profpatsch.exactSource ./. [
+      ./cas-serve.cabal
+      ./CasServe.hs
+    ];
+
+    libraryHaskellDepends = [
+      pkgs.haskellPackages.pa-prelude
+      pkgs.haskellPackages.pa-label
+      pkgs.haskellPackages.ihp-hsx
+      pkgs.haskellPackages.wai
+      pkgs.haskellPackages.warp
+      pkgs.haskellPackages.sqlite-simple
+      depot.users.Profpatsch.arglib.netencode.haskell
+      depot.users.Profpatsch.netencode.netencode-hs
+    ];
+
+    isExecutable = true;
+    isLibrary = false;
+    license = lib.licenses.mit;
+  };
+
+  create-cas-database = depot.nix.writeExecline "create-cas-database" { readNArgs = 1; } [
+    bins.sqlite3
+    "$1"
+    "-init"
+    ./schema.sql
+  ];
 in
 cas-serve
diff --git a/users/Profpatsch/execline/exec-helpers.cabal b/users/Profpatsch/execline/exec-helpers.cabal
index 1262a36ec..b472ff6bd 100644
--- a/users/Profpatsch/execline/exec-helpers.cabal
+++ b/users/Profpatsch/execline/exec-helpers.cabal
@@ -1,4 +1,4 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               exec-helpers
 version:            0.1.0.0
 author:             Profpatsch
diff --git a/users/Profpatsch/hie.yaml b/users/Profpatsch/hie.yaml
index 895120d42..d11a60ac7 100644
--- a/users/Profpatsch/hie.yaml
+++ b/users/Profpatsch/hie.yaml
@@ -2,10 +2,19 @@ cradle:
   cabal:
     - path: "./my-prelude"
       component: "lib:my-prelude"
+    - path: "./netencode"
+      component: "lib:netencode"
+    - path: "./arglib"
+      component: "lib:arglib-netencode"
+    - path: "./execline"
+      component: "lib:exec-helpers"
     - path: "./htmx-experiment/src"
       component: "lib:htmx-experiment"
     - path: "./htmx-experiment/src"
       component: "lib:htmx-experiment"
     - path: "./htmx-experiment/Main.hs"
       component: "htmx-experiment:exe:htmx-experiment"
-
+    - path: "./cas-serve/CasServe.hs"
+      component: "cas-serve:exe:cas-serve"
+    - path: "./jbovlaste-sqlite/JbovlasteSqlite.hs"
+      component: "jbovlaste-sqlite:exe:jbovlaste-sqlite"
diff --git a/users/Profpatsch/htmx-experiment/htmx-experiment.cabal b/users/Profpatsch/htmx-experiment/htmx-experiment.cabal
index e287a8501..11fd16bac 100644
--- a/users/Profpatsch/htmx-experiment/htmx-experiment.cabal
+++ b/users/Profpatsch/htmx-experiment/htmx-experiment.cabal
@@ -1,4 +1,4 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               htmx-experiment
 version:            0.1.0.0
 author:             Profpatsch
diff --git a/users/Profpatsch/ical-smolify/ical-smolify.cabal b/users/Profpatsch/ical-smolify/ical-smolify.cabal
index 571b8267c..d7a46c581 100644
--- a/users/Profpatsch/ical-smolify/ical-smolify.cabal
+++ b/users/Profpatsch/ical-smolify/ical-smolify.cabal
@@ -1,4 +1,4 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               ical-smolify
 version:            0.1.0.0
 author:             Profpatsch
diff --git a/users/Profpatsch/mailbox-org/AesonQQ.hs b/users/Profpatsch/mailbox-org/AesonQQ.hs
index 02e1c2f3d..f12afdf51 100644
--- a/users/Profpatsch/mailbox-org/AesonQQ.hs
+++ b/users/Profpatsch/mailbox-org/AesonQQ.hs
@@ -4,7 +4,7 @@ module AesonQQ where
 
 import Data.Aeson qualified as Json
 import Data.Either qualified as Either
-import MyPrelude
+import PossehlAnalyticsPrelude
 import PyF qualified
 import PyF.Internal.QQ qualified as PyFConf
 
diff --git a/users/Profpatsch/mailbox-org/MailboxOrg.hs b/users/Profpatsch/mailbox-org/MailboxOrg.hs
index 5e0629795..c66db49c1 100644
--- a/users/Profpatsch/mailbox-org/MailboxOrg.hs
+++ b/users/Profpatsch/mailbox-org/MailboxOrg.hs
@@ -6,6 +6,7 @@
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedRecordDot #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PackageImports #-}
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE NoFieldSelectors #-}
@@ -24,7 +25,7 @@ import Data.Aeson.KeyMap qualified as KeyMap
 import Data.ByteString qualified as ByteString
 import Data.ByteString.Lazy qualified as Lazy
 import Data.Char qualified as Char
-import Data.Error.Tree
+import "pa-error-tree" Data.Error.Tree
 import Data.Functor.Compose
 import Data.List qualified as List
 import Data.Map.Strict qualified as Map
@@ -32,11 +33,11 @@ import Data.Text qualified as Text
 import ExecHelpers
 import GHC.Records (HasField (..))
 import Label
-import MyPrelude
 import Netencode qualified
 import Netencode.Parse qualified as NetParse
 import Network.HTTP.Conduit qualified as Client
 import Network.HTTP.Simple qualified as Client
+import PossehlAnalyticsPrelude
 import Pretty
 import System.Directory qualified as File
 import System.Environment qualified as Env
diff --git a/users/Profpatsch/mailbox-org/default.nix b/users/Profpatsch/mailbox-org/default.nix
index 0387c7b12..2cb4c7af8 100644
--- a/users/Profpatsch/mailbox-org/default.nix
+++ b/users/Profpatsch/mailbox-org/default.nix
@@ -16,6 +16,8 @@ let
       depot.users.Profpatsch.execline.exec-helpers-hs
       depot.users.Profpatsch.arglib.netencode.haskell
       pkgs.haskellPackages.pa-prelude
+      pkgs.haskellPackages.pa-label
+      pkgs.haskellPackages.pa-error-tree
       pkgs.haskellPackages.aeson
       pkgs.haskellPackages.http-conduit
       pkgs.haskellPackages.aeson-better-errors
diff --git a/users/Profpatsch/mailbox-org/mailbox-org.cabal b/users/Profpatsch/mailbox-org/mailbox-org.cabal
index c4b04ce66..8125baef7 100644
--- a/users/Profpatsch/mailbox-org/mailbox-org.cabal
+++ b/users/Profpatsch/mailbox-org/mailbox-org.cabal
@@ -1,4 +1,4 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               mailbox-org
 version:            0.1.0.0
 author:             Profpatsch
@@ -10,7 +10,9 @@ executable mailbox-org
     build-depends:
         base >=4.15 && <5,
         my-prelude,
+        pa-prelude,
         pa-label,
+        pa-error-tree,
         exec-helpers,
         netencode,
         text,
diff --git a/users/Profpatsch/my-prelude/Data/Error/Tree.hs b/users/Profpatsch/my-prelude/Data/Error/Tree.hs
deleted file mode 100644
index e8e45e704..000000000
--- a/users/Profpatsch/my-prelude/Data/Error/Tree.hs
+++ /dev/null
@@ -1,113 +0,0 @@
-{-# LANGUAGE DerivingStrategies #-}
-{-# LANGUAGE GHC2021 #-}
-{-# LANGUAGE OverloadedRecordDot #-}
-
-module Data.Error.Tree where
-
-import Data.String (IsString (..))
-import Data.Tree qualified as Tree
-import MyPrelude
-
--- | A tree of 'Error's, with a single root 'Error' and 0..n nested 'ErrorTree's.
---
--- @@
--- top error
--- |
--- |-- error 1
--- | |
--- |  -- error 1.1
--- |
--- |-- error 2
--- @@
-newtype ErrorTree = ErrorTree {unErrorTree :: (Tree.Tree Error)}
-  deriving stock (Show)
-
-instance IsString ErrorTree where
-  fromString = singleError . fromString
-
--- deriving newtype (Ord) -- TODO: Add this instance with containers-0.6.5
-
--- | Turn a single 'Error' into an 'ErrorTree', a leaf.
-singleError :: Error -> ErrorTree
-singleError e = ErrorTree $ Tree.Node e []
-
--- | Take a list of errors & create a new 'ErrorTree' with the given 'Error' as the root.
-errorTree :: Error -> NonEmpty Error -> ErrorTree
-errorTree topLevelErr nestedErrs =
-  ErrorTree
-    ( Tree.Node
-        topLevelErr
-        (nestedErrs <&> (\e -> Tree.Node e []) & toList)
-    )
-
--- | Attach more context to the root 'Error' of the 'ErrorTree', via 'errorContext'.
-errorTreeContext :: Text -> ErrorTree -> ErrorTree
-errorTreeContext context (ErrorTree tree) =
-  ErrorTree $
-    tree
-      { Tree.rootLabel = tree.rootLabel & errorContext context
-      }
-
--- | Nest the given 'Error' around the ErrorTree
---
--- @@
--- top level error
--- |
--- -- nestedError
---   |
---   -- error 1
---   |
---   -- error 2
--- @@
-nestedError ::
-  Error -> -- top level
-  ErrorTree -> -- nested
-  ErrorTree
-nestedError topLevelErr nestedErr =
-  ErrorTree $
-    Tree.Node
-      { Tree.rootLabel = topLevelErr,
-        Tree.subForest = [nestedErr.unErrorTree]
-      }
-
--- | Nest the given 'Error' around the list of 'ErrorTree's.
---
--- @@
--- top level error
--- |
--- |- nestedError1
--- | |
--- | -- error 1
--- | |
--- | -- error 2
--- |
--- |- nestedError 2
--- @@
-nestedMultiError ::
-  Error -> -- top level
-  NonEmpty ErrorTree -> -- nested
-  ErrorTree
-nestedMultiError topLevelErr nestedErrs =
-  ErrorTree $
-    Tree.Node
-      { Tree.rootLabel = topLevelErr,
-        Tree.subForest = nestedErrs & toList <&> (.unErrorTree)
-      }
-
-prettyErrorTree :: ErrorTree -> Text
-prettyErrorTree (ErrorTree tree) =
-  tree
-    <&> prettyError
-    <&> textToString
-    & Tree.drawTree
-    & stringToText
-
-prettyErrorTrees :: NonEmpty ErrorTree -> Text
-prettyErrorTrees forest =
-  forest
-    <&> (.unErrorTree)
-    <&> fmap prettyError
-    <&> fmap textToString
-    & toList
-    & Tree.drawForest
-    & stringToText
diff --git a/users/Profpatsch/my-prelude/default.nix b/users/Profpatsch/my-prelude/default.nix
index 1fa8075c5..0c582c958 100644
--- a/users/Profpatsch/my-prelude/default.nix
+++ b/users/Profpatsch/my-prelude/default.nix
@@ -8,7 +8,6 @@ pkgs.haskellPackages.mkDerivation {
     ./my-prelude.cabal
     ./MyPrelude.hs
     ./Pretty.hs
-    ./Data/Error/Tree.hs
     ./Aeson.hs
     ./RunCommand.hs
     ./Test.hs
@@ -18,6 +17,7 @@ pkgs.haskellPackages.mkDerivation {
 
   libraryHaskellDepends = [
     pkgs.haskellPackages.pa-label
+    pkgs.haskellPackages.pa-error-tree
     pkgs.haskellPackages.aeson
     pkgs.haskellPackages.aeson-better-errors
     pkgs.haskellPackages.PyF
diff --git a/users/Profpatsch/my-prelude/my-prelude.cabal b/users/Profpatsch/my-prelude/my-prelude.cabal
index 283f9f713..fad13300a 100644
--- a/users/Profpatsch/my-prelude/my-prelude.cabal
+++ b/users/Profpatsch/my-prelude/my-prelude.cabal
@@ -1,4 +1,4 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               my-prelude
 version:            0.0.1.0
 author:             Profpatsch
@@ -8,7 +8,6 @@ library
     exposed-modules:
       MyPrelude
       Pretty
-      Data.Error.Tree
       Aeson
       RunCommand
       Test
@@ -21,6 +20,7 @@ library
     build-depends:
        base >=4.15 && <5
      , pa-label
+     , pa-error-tree
      , aeson
      , aeson-better-errors
      , PyF
diff --git a/users/Profpatsch/netencode/Netencode.hs b/users/Profpatsch/netencode/Netencode.hs
index 36d3907ff..ca93ab2fe 100644
--- a/users/Profpatsch/netencode/Netencode.hs
+++ b/users/Profpatsch/netencode/Netencode.hs
@@ -1,15 +1,6 @@
 {-# LANGUAGE AllowAmbiguousTypes #-}
-{-# LANGUAGE DeriveFunctor #-}
-{-# LANGUAGE DerivingStrategies #-}
-{-# LANGUAGE GHC2021 #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
-{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TemplateHaskell #-}
-{-# LANGUAGE TypeApplications #-}
 
 module Netencode where
 
@@ -20,15 +11,12 @@ import Data.ByteString qualified as ByteString
 import Data.ByteString.Builder (Builder)
 import Data.ByteString.Builder qualified as Builder
 import Data.ByteString.Lazy qualified as ByteString.Lazy
-import Data.Coerce (coerce)
 import Data.Fix (Fix (Fix))
 import Data.Fix qualified as Fix
 import Data.Functor.Classes (Eq1 (liftEq))
 import Data.Int (Int16, Int32, Int64, Int8)
-import Data.List.NonEmpty (nonEmpty)
 import Data.Map.NonEmpty (NEMap)
 import Data.Map.NonEmpty qualified as NEMap
-import Data.Maybe (fromMaybe)
 import Data.Semigroup qualified as Semi
 import Data.String (IsString)
 import Data.Word (Word16, Word32, Word64)
@@ -36,7 +24,7 @@ import GHC.Exts (fromString)
 import Hedgehog qualified as Hedge
 import Hedgehog.Gen qualified as Gen
 import Hedgehog.Range qualified as Range
-import MyPrelude
+import PossehlAnalyticsPrelude
 import Text.Show.Deriving
 import Prelude hiding (sum)
 
@@ -74,7 +62,7 @@ instance Eq1 TF where
   liftEq _ (I6 i64) (I6 i64') = i64 == i64'
   liftEq _ (Text t) (Text t') = t == t'
   liftEq _ (Bytes b) (Bytes b') = b == b'
-  liftEq eq (Sum t) (Sum t') = eq (t & tagVal) (t' & tagVal)
+  liftEq eq (Sum t) (Sum t') = eq (t.tagVal) (t'.tagVal)
   liftEq eq (Record m) (Record m') = liftEq eq m m'
   liftEq eq (List xs) (List xs') = liftEq eq xs xs'
   liftEq _ _ _ = False
@@ -292,7 +280,7 @@ netencodeParserF inner = do
           Just tags ->
             pure $
               tags
-                <&> (\t -> (t & tagTag, t & tagVal))
+                <&> (\t -> (t.tagTag, t.tagVal))
                 -- later keys are preferred if they are duplicates, according to the standard
                 & NEMap.fromList
       _ <- Atto.Char.char '}' Atto.<?> "record did not end with }"
diff --git a/users/Profpatsch/netencode/Netencode/Parse.hs b/users/Profpatsch/netencode/Netencode/Parse.hs
index de313571f..adfd1e0a6 100644
--- a/users/Profpatsch/netencode/Netencode/Parse.hs
+++ b/users/Profpatsch/netencode/Netencode/Parse.hs
@@ -1,14 +1,4 @@
-{-# LANGUAGE ApplicativeDo #-}
-{-# LANGUAGE DataKinds #-}
-{-# LANGUAGE DerivingVia #-}
-{-# LANGUAGE GHC2021 #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE OverloadedRecordDot #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
-{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE NoFieldSelectors #-}
-{-# OPTIONS_GHC -Wall #-}
 
 module Netencode.Parse where
 
@@ -23,8 +13,9 @@ import Data.Map.NonEmpty qualified as NEMap
 import Data.Semigroupoid qualified as Semigroupiod
 import Data.Semigroupoid qualified as Semigroupoid
 import Data.Text qualified as Text
-import MyPrelude
+import Label
 import Netencode qualified
+import PossehlAnalyticsPrelude
 import Prelude hiding (log)
 
 newtype Parse from to
diff --git a/users/Profpatsch/netencode/default.nix b/users/Profpatsch/netencode/default.nix
index cb3dfaee4..6e7dce489 100644
--- a/users/Profpatsch/netencode/default.nix
+++ b/users/Profpatsch/netencode/default.nix
@@ -28,7 +28,9 @@ let
       pkgs.haskellPackages.data-fix
       pkgs.haskellPackages.bytestring
       pkgs.haskellPackages.attoparsec
-      depot.users.Profpatsch.my-prelude
+      pkgs.haskellPackages.pa-prelude
+      pkgs.haskellPackages.pa-label
+      pkgs.haskellPackages.pa-error-tree
     ];
 
     isLibrary = true;
diff --git a/users/Profpatsch/netencode/netencode.cabal b/users/Profpatsch/netencode/netencode.cabal
index 4e418d6dd..7bff4487b 100644
--- a/users/Profpatsch/netencode/netencode.cabal
+++ b/users/Profpatsch/netencode/netencode.cabal
@@ -1,25 +1,74 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               netencode
 version:            0.1.0.0
 author:             Profpatsch
 maintainer:         mail@profpatsch.de
 
+
+common common-options
+  ghc-options:
+      -Wall
+      -Wno-type-defaults
+      -Wunused-packages
+      -Wredundant-constraints
+      -fwarn-missing-deriving-strategies
+
+  -- See https://downloads.haskell.org/ghc/latest/docs/users_guide/exts.html
+  -- for a description of all these extensions
+  default-extensions:
+      -- Infer Applicative instead of Monad where possible
+    ApplicativeDo
+
+    -- Allow literal strings to be Text
+    OverloadedStrings
+
+    -- Syntactic sugar improvements
+    LambdaCase
+    MultiWayIf
+
+    -- Makes the (deprecated) usage of * instead of Data.Kind.Type an error
+    NoStarIsType
+
+    -- Convenient and crucial to deal with ambiguous field names, commonly
+    -- known as RecordDotSyntax
+    OverloadedRecordDot
+
+    -- does not export record fields as functions, use OverloadedRecordDot to access instead
+    NoFieldSelectors
+
+    -- Record punning
+    RecordWildCards
+
+    -- Improved Deriving
+    DerivingStrategies
+    DerivingVia
+
+    -- Type-level strings
+    DataKinds
+
+    -- to enable the `type` keyword in import lists (ormolu uses this automatically)
+    ExplicitNamespaces
+
+  default-language: GHC2021
+
+
 library
+    import: common-options
     exposed-modules:
         Netencode,
         Netencode.Parse
 
     build-depends:
         base >=4.15 && <5,
+        pa-prelude,
+        pa-label,
+        pa-error-tree,
         hedgehog,
         nonempty-containers,
         deriving-compat,
-        my-prelude,
         data-fix,
         bytestring,
         attoparsec,
         text,
         semigroupoids,
         selective
-
-    default-language: Haskell2010
diff --git a/users/Profpatsch/reverse-haskell-deps/reverse-haskell-deps.cabal b/users/Profpatsch/reverse-haskell-deps/reverse-haskell-deps.cabal
index d8dd5cbe5..4792f52ad 100644
--- a/users/Profpatsch/reverse-haskell-deps/reverse-haskell-deps.cabal
+++ b/users/Profpatsch/reverse-haskell-deps/reverse-haskell-deps.cabal
@@ -1,4 +1,4 @@
-cabal-version:      2.4
+cabal-version:      3.0
 name:               reverse-haskell-deps
 version:            0.1.0.0
 author:             Profpatsch
diff --git a/users/Profpatsch/shell.nix b/users/Profpatsch/shell.nix
index 640be96cd..2f33f2bb2 100644
--- a/users/Profpatsch/shell.nix
+++ b/users/Profpatsch/shell.nix
@@ -21,6 +21,7 @@ pkgs.mkShell {
       h.ihp-hsx
       h.PyF
       h.unliftio
+      h.xml-conduit
       h.wai
       h.wai-extra
       h.warp
@@ -42,11 +43,8 @@ pkgs.mkShell {
       h.case-insensitive
       h.hscolour
       h.nicify-lib
+      h.hspec
       h.hspec-expectations-pretty-diff
-      depot.users.Profpatsch.my-prelude
-      depot.users.Profpatsch.netencode.netencode-hs
-      depot.users.Profpatsch.arglib.netencode.haskell
-      depot.users.Profpatsch.execline.exec-helpers-hs
     ]))
 
     pkgs.rustup