docs: Add cross-references between README, Database Management Guide, and Compatibility Matrix

- Link Quick Start Guide from README First Run section
- Add Database Management Guide link in README System Requirements
- Link Compatibility Matrix from Database Management Guide schema version sections
- Link Compatibility Matrix from auto-migration and version upgrade sections
- Improve documentation navigation and version compatibility awareness

Author: CIS Guru

Documentation/Database-Management-Guide.md

@@ -114,10 +114,15 @@ When you upgrade Aquiis SimpleStart to a new version:
 
 **No manual intervention required** - migrations are automatic and seamless!
 
+**Version Upgrade Compatibility:**  
+Not all version upgrades are supported automatically. Check the **[Compatibility Matrix](Compatibility-Matrix.md)** before upgrading to see if your current version can auto-migrate to the target version, or if manual steps are required.
+
 #### Migration to v1.1.0
 
 When upgrading from v1.0.0 to v1.1.0, the following schema changes are automatically applied:
 
+> **Note:** For complete version compatibility information and upgrade paths, see the **[Compatibility Matrix](Compatibility-Matrix.md)**.
+
 **New Tables:**
 
 - **DatabaseSettings** - Tracks encryption state and configuration
@@ -150,6 +155,9 @@ When upgrading from v1.0.0 to v1.1.0, the following schema changes are automatic
 
 **Important:** v1.1.0 application **requires** v1.1.0 database schema - the DatabaseSettings table is queried on startup. Running v1.1.0 app with v1.0.0 database will result in an error.
 
+**Version Compatibility:**  
+See the **[Compatibility Matrix](Compatibility-Matrix.md)** for detailed information about which app versions work with which database versions, and whether automatic migration is available.
+
 ---
 
 ## 🔐 Backup Procedures
@@ -972,13 +980,13 @@ The compiled model lives in `1-Aquiis.Infrastructure/Data/CompiledModels/` and i
 
 **When to regenerate the compiled model:**
 
-| Change | Re-run optimize? |
-|---|---|
-| Add / remove entity or property | ✅ Yes |
-| Add / modify relationship or index | ✅ Yes |
-| Rename entity or property | ✅ Yes |
-| Data-only migration (seed data, no schema change) | ❌ No |
-| Bug fix with no model changes | ❌ No |
+| Change                                            | Re-run optimize? |
+| ------------------------------------------------- | ---------------- |
+| Add / remove entity or property                   | ✅ Yes           |
+| Add / modify relationship or index                | ✅ Yes           |
+| Rename entity or property                         | ✅ Yes           |
+| Data-only migration (seed data, no schema change) | ❌ No            |
+| Bug fix with no model changes                     | ❌ No            |
 
 > **Note:** If the compiled model is stale, EF Core throws an `InvalidOperationException` at startup — the app will not silently use wrong metadata.
 

README.md

@@ -144,6 +144,8 @@ Get-FileHash "Aquiis-1.1.0-x64-Setup.exe" -Algorithm SHA256
 3. Register your **first user account**
 4. Start managing properties!
 
+**New to Aquiis?** Follow our **[Quick Start Guide](Documentation/Quick-Start-Guide.md)** for a 15-minute tutorial.
+
 ### 15-Minute Tutorial
 
 Follow our [Quick Start Guide](Documentation/Quick-Start-Guide.md) to:
@@ -186,6 +188,12 @@ Aquiis is available as a portable Windows executable (.exe). No installation req
 - All dependencies bundled (no installation required)
 - Optional: SendGrid (email) and Twilio (SMS) for notifications
 
+### Data & Backups
+
+- SQLite database stored locally in application data folder
+- Regular backups recommended (manual or scheduled)
+- See **[Database Management Guide](Documentation/Database-Management-Guide.md)** for backup/restore procedures
+
 ---
 
 ## 📚 Documentation