add dbgate and mssql

docs/services.md

@@ -135,6 +135,38 @@ Running
 
 ---
 
+### Microsoft SQL Server Express
+
+Purpose:
+
+* Support applications requiring Microsoft SQL Server
+* Run alongside PostgreSQL as a private database platform
+
+Image:
+
+```text
+mcr.microsoft.com/mssql/server:2022-latest
+```
+
+Network:
+
+```text
+internal
+```
+
+Exposure:
+
+* Port 1433 is not published
+* Not routed through Nginx Proxy Manager
+
+Status:
+
+```text
+Operational
+```
+
+---
+
 ### BaGet
 
 URL:
@@ -202,6 +234,38 @@ Operational
 
 ---
 
+### DbGate
+
+URL:
+
+```text
+https://dbgate.silveressence.net
+```
+
+Purpose:
+
+* Browser-based MSSQL administration
+* Browser-based PostgreSQL administration
+
+Networks:
+
+* `internal` for private database connectivity
+* `proxy` for Nginx Proxy Manager
+
+Security:
+
+* HTTPS enforced
+* DbGate username and password required
+* Database ports remain private
+
+Status:
+
+```text
+Operational
+```
+
+---
+
 ## Shared Infrastructure
 
 ### Docker