diff --git a/Dockerfile b/Dockerfile
index 81de087..b654200 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,20 @@
 FROM golang:1.26-alpine AS build
 WORKDIR /src
-COPY go.mod ./
+
+# Keep dependency resolution deterministic. Do NOT run `go mod tidy` before
+# source files are present: it can remove required modules because no packages
+# are visible yet.
+COPY go.mod go.sum ./
 RUN go mod download
+
 COPY cmd ./cmd
 COPY internal ./internal
+
+# Fail early with a useful message if a repository/.dockerignore rule ever
+# drops the application's internal data package from the build context.
+RUN test -f /src/internal/data/store.go \
+ && test -f /src/internal/data/schema.sql
+
 RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/neuralhunt ./cmd/server \
  && CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/neuralhunt-client ./cmd/client
 
diff --git a/go.mod b/go.mod
index 88b2824..1dcd9df 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module neuralhunt
 
-go 1.23.0
+go 1.26
 
 require (
 	github.com/go-chi/chi/v5 v5.2.1
diff --git a/run-load.ps1 b/run-load.ps1
index 10938a1..5167247 100644
--- a/run-load.ps1
+++ b/run-load.ps1
@@ -1,45 +1,45 @@
-param(
-    [switch]$NoEnv
-)
-
-$ErrorActionPreference = "Stop"
-Set-StrictMode -Version Latest
-
-$ProjectRoot = $PSScriptRoot
-Set-Location $ProjectRoot
-
-function Import-DotEnv {
-    param([Parameter(Mandatory = $true)][string]$Path)
-
-    Get-Content -LiteralPath $Path | ForEach-Object {
-        $line = $_.Trim()
-        if (-not $line -or $line.StartsWith("#")) { return }
-
-        $parts = $line.Split("=", 2)
-        if ($parts.Count -ne 2) { return }
-
-        $name = $parts[0].Trim()
-        $value = $parts[1].Trim()
-        if (-not $name) { return }
-
-        if (($value.StartsWith('"') -and $value.EndsWith('"')) -or
-            ($value.StartsWith("'") -and $value.EndsWith("'"))) {
-            $value = $value.Substring(1, $value.Length - 2)
-        }
-
-        [Environment]::SetEnvironmentVariable($name, $value, "Process")
-    }
-}
-
-if (-not $NoEnv) {
-    $envFile = Join-Path $ProjectRoot ".env"
-    if (Test-Path -LiteralPath $envFile) {
-        Import-DotEnv -Path $envFile
-    }
-    else {
-        Write-Warning ".env nicht gefunden. Es werden vorhandene Umgebungsvariablen und Programm-Defaults verwendet."
-    }
-}
-
-go run ./cmd/loadtest
-exit $LASTEXITCODE
+param(
+    [switch]$NoEnv
+)
+
+$ErrorActionPreference = "Stop"
+Set-StrictMode -Version Latest
+
+$ProjectRoot = $PSScriptRoot
+Set-Location $ProjectRoot
+
+function Import-DotEnv {
+    param([Parameter(Mandatory = $true)][string]$Path)
+
+    Get-Content -LiteralPath $Path | ForEach-Object {
+        $line = $_.Trim()
+        if (-not $line -or $line.StartsWith("#")) { return }
+
+        $parts = $line.Split("=", 2)
+        if ($parts.Count -ne 2) { return }
+
+        $name = $parts[0].Trim()
+        $value = $parts[1].Trim()
+        if (-not $name) { return }
+
+        if (($value.StartsWith('"') -and $value.EndsWith('"')) -or
+            ($value.StartsWith("'") -and $value.EndsWith("'"))) {
+            $value = $value.Substring(1, $value.Length - 2)
+        }
+
+        [Environment]::SetEnvironmentVariable($name, $value, "Process")
+    }
+}
+
+if (-not $NoEnv) {
+    $envFile = Join-Path $ProjectRoot ".env"
+    if (Test-Path -LiteralPath $envFile) {
+        Import-DotEnv -Path $envFile
+    }
+    else {
+        Write-Warning ".env nicht gefunden. Es werden vorhandene Umgebungsvariablen und Programm-Defaults verwendet."
+    }
+}
+
+go run ./cmd/loadtest
+exit $LASTEXITCODE