diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 0d3cb38..a135d93 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,29 +5,8 @@
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-      <change beforePath="$PROJECT_DIR$/src/datasources/zabbix-usergroups.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/datasources/zabbix-usergroups.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/execution/host_exporter.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/execution/host_exporter.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/execution/template_deleter.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/execution/template_deleter.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/execution/template_importer.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/execution/template_importer.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/schema/generated/graphql.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/schema/generated/graphql.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/host_importer.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/host_importer.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/host_integration.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/host_integration.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/host_query.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/host_query.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/misc_resolvers.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/misc_resolvers.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/template_deleter.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/template_deleter.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/template_importer.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/template_importer.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/template_integration.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/template_integration.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/template_query.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/template_query.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/user_rights.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/user_rights.test.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/user_rights_integration.test.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/user_rights_integration.test.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.junie/guidelines.md" beforeDir="false" afterPath="$PROJECT_DIR$/.junie/guidelines.md" afterDir="false" />
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     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -65,6 +44,9 @@
     <commands />
     <urls />
   </component>
+  <component name="ProblemsViewState">
+    <option name="selectedTabId" value="CurrentFile" />
+  </component>
   <component name="ProjectColorInfo">{
   &quot;associatedIndex&quot;: 2
 }</component>
@@ -76,44 +58,45 @@
     <option name="openDirectoriesWithSingleClick" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
-  <component name="PropertiesComponent">{
-  &quot;keyToString&quot;: {
-    &quot;NIXITCH_NIXPKGS_CONFIG&quot;: &quot;&quot;,
-    &quot;NIXITCH_NIX_CONF_DIR&quot;: &quot;&quot;,
-    &quot;NIXITCH_NIX_OTHER_STORES&quot;: &quot;&quot;,
-    &quot;NIXITCH_NIX_PATH&quot;: &quot;&quot;,
-    &quot;NIXITCH_NIX_PROFILES&quot;: &quot;&quot;,
-    &quot;NIXITCH_NIX_REMOTE&quot;: &quot;&quot;,
-    &quot;NIXITCH_NIX_USER_PROFILE_DIR&quot;: &quot;&quot;,
-    &quot;Node.js.index.ts.executor&quot;: &quot;Run&quot;,
-    &quot;RunOnceActivity.MCP Project settings loaded&quot;: &quot;true&quot;,
-    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
-    &quot;RunOnceActivity.TerminalTabsStorage.copyFrom.TerminalArrangementManager.252&quot;: &quot;true&quot;,
-    &quot;RunOnceActivity.git.unshallow&quot;: &quot;true&quot;,
-    &quot;RunOnceActivity.typescript.service.memoryLimit.init&quot;: &quot;true&quot;,
-    &quot;com.intellij.ml.llm.matterhorn.ej.ui.settings.DefaultModelSelectionForGA.v1&quot;: &quot;true&quot;,
-    &quot;git-widget-placeholder&quot;: &quot;main&quot;,
-    &quot;go.import.settings.migrated&quot;: &quot;true&quot;,
-    &quot;javascript.preferred.runtime.type.id&quot;: &quot;node&quot;,
-    &quot;junie.onboarding.icon.badge.shown&quot;: &quot;true&quot;,
-    &quot;last_opened_file_path&quot;: &quot;//wsl.localhost/Ubuntu/home/ahilbig/git/vcr/zabbix-graphql-api/src&quot;,
-    &quot;node.js.detected.package.eslint&quot;: &quot;true&quot;,
-    &quot;node.js.detected.package.tslint&quot;: &quot;true&quot;,
-    &quot;node.js.selected.package.eslint&quot;: &quot;(autodetect)&quot;,
-    &quot;node.js.selected.package.tslint&quot;: &quot;(autodetect)&quot;,
-    &quot;nodejs_interpreter_path&quot;: &quot;wsl://Ubuntu@/home/ahilbig/.nvm/versions/node/v24.12.0/bin/node&quot;,
-    &quot;nodejs_package_manager_path&quot;: &quot;npm&quot;,
-    &quot;npm.codegen.executor&quot;: &quot;Run&quot;,
-    &quot;npm.compile.executor&quot;: &quot;Run&quot;,
-    &quot;npm.copy-schema.executor&quot;: &quot;Run&quot;,
-    &quot;npm.prod.executor&quot;: &quot;Run&quot;,
-    &quot;npm.test.executor&quot;: &quot;Run&quot;,
-    &quot;settings.editor.selected.configurable&quot;: &quot;settings.javascript.runtime&quot;,
-    &quot;to.speed.mode.migration.done&quot;: &quot;true&quot;,
-    &quot;ts.external.directory.path&quot;: &quot;\\\\wsl.localhost\\Ubuntu\\home\\ahilbig\\git\\vcr\\zabbix-graphql-api\\node_modules\\typescript\\lib&quot;,
-    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "NIXITCH_NIXPKGS_CONFIG": "",
+    "NIXITCH_NIX_CONF_DIR": "",
+    "NIXITCH_NIX_OTHER_STORES": "",
+    "NIXITCH_NIX_PATH": "",
+    "NIXITCH_NIX_PROFILES": "",
+    "NIXITCH_NIX_REMOTE": "",
+    "NIXITCH_NIX_USER_PROFILE_DIR": "",
+    "Node.js.index.ts.executor": "Run",
+    "RunOnceActivity.MCP Project settings loaded": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "RunOnceActivity.TerminalTabsStorage.copyFrom.TerminalArrangementManager.252": "true",
+    "RunOnceActivity.git.unshallow": "true",
+    "RunOnceActivity.typescript.service.memoryLimit.init": "true",
+    "com.intellij.ml.llm.matterhorn.ej.ui.settings.DefaultModelSelectionForGA.v1": "true",
+    "git-widget-placeholder": "main",
+    "go.import.settings.migrated": "true",
+    "javascript.preferred.runtime.type.id": "node",
+    "junie.onboarding.icon.badge.shown": "true",
+    "last_opened_file_path": "//wsl.localhost/Ubuntu/home/ahilbig/git/vcr/zabbix-graphql-api/src",
+    "node.js.detected.package.eslint": "true",
+    "node.js.detected.package.tslint": "true",
+    "node.js.selected.package.eslint": "(autodetect)",
+    "node.js.selected.package.tslint": "(autodetect)",
+    "nodejs_interpreter_path": "wsl://Ubuntu@/home/ahilbig/.nvm/versions/node/v24.12.0/bin/node",
+    "nodejs_package_manager_path": "npm",
+    "npm.codegen.executor": "Run",
+    "npm.compile.executor": "Run",
+    "npm.copy-schema.executor": "Run",
+    "npm.prod.executor": "Run",
+    "npm.test.executor": "Run",
+    "settings.editor.selected.configurable": "ml.llm.LLMConfigurable",
+    "settings.editor.splitter.proportion": "0.3839406",
+    "to.speed.mode.migration.done": "true",
+    "ts.external.directory.path": "\\\\wsl.localhost\\Ubuntu\\home\\ahilbig\\git\\vcr\\zabbix-graphql-api\\node_modules\\typescript\\lib",
+    "vue.rearranger.settings.migration": "true"
   }
-}</component>
+}]]></component>
   <component name="RecapSpentCounter">
     <option name="endsOfQuotaMs" value="1768327208764" />
     <option name="spentUsd" value="0.04010335" />
@@ -382,7 +365,15 @@
       <option name="project" value="LOCAL" />
       <updated>1769535965695</updated>
     </task>
-    <option name="localTasksCounter" value="22" />
+    <task id="LOCAL-00022" summary="chore: add tests for schema and API config mocking&#10;&#10;- Added unit tests for schema loader, mocking Config variables and resolvers.&#10;- Added unit tests for Zabbix API configuration, verifying constants derived from Config.&#10;- Mocked relevant modules and filesystem behaviors to enable isolated testing.&#10;- Optimized imports on all files and include this within a new .junie/guidelines.md file">
+      <option name="closed" value="true" />
+      <created>1769582068426</created>
+      <option name="number" value="00022" />
+      <option name="presentableId" value="LOCAL-00022" />
+      <option name="project" value="LOCAL" />
+      <updated>1769582068426</updated>
+    </task>
+    <option name="localTasksCounter" value="23" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
diff --git a/.junie/guidelines.md b/.junie/guidelines.md
index c72f30e..da28a59 100644
--- a/.junie/guidelines.md
+++ b/.junie/guidelines.md
@@ -1,4 +1,37 @@
-# Junie Guidelines
+# Project Guidelines
 
-- Always include "Optimize imports" as a step in the plan before executing any commits or finishing a task (via `submit`).
-- This ensures consistency with the project's IntelliJ IDEA settings (`OPTIMIZE_IMPORTS_BEFORE_PROJECT_COMMIT` is enabled).
+This document provides concise information and best practices for developers working on the Zabbix GraphQL API project.
+
+## Tech Stack
+- **Runtime**: Node.js (v18+)
+- **Language**: TypeScript (ESM)
+- **API**: GraphQL (Apollo Server 4)
+- **Testing**: Jest
+- **Deployment**: Docker
+
+## Project Structure
+- `src/api/`: GraphQL server configuration, schema loading, and root resolvers (see `createResolvers` in `resolvers.ts`).
+- `src/datasources/`: Modular classes for interacting with various Zabbix API components (hosts, items, etc.).
+- `src/execution/`: Business logic for complex, multi-step operations (importers, exporters, deleters).
+- `src/model/`: Shared data models and enumerations.
+- `src/test/`: Unit and integration tests.
+- `schema/`: GraphQL Schema Definition Language (SDL) files.
+
+## Common Scripts
+- `npm run start`: Launches the development server with `tsx` and `nodemon` for hot-reloading.
+- `npm run test`: Executes the Jest test suite.
+- `npm run codegen`: Generates TypeScript types based on the GraphQL schema definitions.
+- `npm run compile`: Compiles TypeScript source files into the `dist/` directory.
+- `npm run prod`: Prepares the schema and runs the compiled production build.
+
+## Best Practices & Standards
+- **ESM & Imports**: The project uses ECMAScript Modules (ESM). Always use the `.js` extension when importing local files (e.g., `import { Config } from "../common_utils.js";`), even though the source files are `.ts`.
+- **Configuration**: Always use the `Config` class to access environment variables. Avoid direct `process.env` calls.
+- **Type Safety**: Leverage types generated via `npm run codegen` for resolvers and data handling to ensure consistency with the schema.
+- **Import Optimization**: 
+    - Always optimize imports before committing. 
+    - Project setting `OPTIMIZE_IMPORTS_BEFORE_PROJECT_COMMIT` is enabled.
+    - Junie should include "Optimize imports" as a step in every plan.
+- **Modular Datasources**: When adding support for new Zabbix features, create a new datasource class in `src/datasources/` extending `ZabbixRESTDataSource`.
+- **Schema Organization**: Place GraphQL SDL files in the `schema/` directory. Use descriptive comments in SDL as they are used for API documentation.
+- **Testing**: Write reproduction tests for bugs and cover new features with both unit and integration tests in `src/test/`.