updating to match everything in my homelab.

diagrams/database-strategy.mmd

@@ -0,0 +1,96 @@
+```plaintext
+%% Database Strategy with CloudNativePG (ADR-0027)
+%% C4 Component diagram showing CNPG operator and clusters
+
+flowchart TB
+    subgraph operator["🎛️ CNPG Operator"]
+        cnpg["CloudNativePG<br/>Controller<br/>(cnpg-system)"]
+    end
+
+    subgraph clusters["📊 PostgreSQL Clusters"]
+        direction LR
+        
+        subgraph gitea_pg["gitea-pg"]
+            direction TB
+            g_primary["🔵 Primary"]
+            g_replica1["⚪ Replica"]
+            g_replica2["⚪ Replica"]
+            g_bouncer["🔗 PgBouncer"]
+        end
+
+        subgraph authentik_db["authentik-db"]
+            direction TB
+            a_primary["🔵 Primary"]
+            a_replica1["⚪ Replica"]
+            a_replica2["⚪ Replica"]
+            a_bouncer["🔗 PgBouncer"]
+        end
+
+        subgraph companions_db["companions-db"]
+            direction TB
+            c_primary["🔵 Primary"]
+            c_replica1["⚪ Replica"]
+            c_replica2["⚪ Replica"]
+            c_bouncer["🔗 PgBouncer"]
+        end
+
+        subgraph mlflow_db["mlflow-db"]
+            direction TB
+            m_primary["🔵 Primary"]
+        end
+    end
+
+    subgraph storage["💾 Storage"]
+        longhorn["Longhorn PVCs<br/>(NVMe/SSD)"]
+        s3["S3 Backups<br/>(barman)"]
+    end
+
+    subgraph services["🔌 Service Discovery"]
+        direction TB
+        rw["-rw (read-write)"]
+        ro["-ro (read-only)"]
+        pooler["-pooler-rw<br/>(PgBouncer)"]
+    end
+
+    subgraph apps["📦 Applications"]
+        gitea["Gitea"]
+        authentik["Authentik"]
+        companions["Companions"]
+        mlflow["MLflow"]
+    end
+
+    %% Operator manages clusters
+    cnpg -->|"Manages"| clusters
+
+    %% Storage connections
+    clusters --> longhorn
+    clusters -->|"WAL archiving"| s3
+
+    %% Service routing
+    g_bouncer --> rw
+    a_bouncer --> rw
+    c_bouncer --> rw
+    g_replica1 --> ro
+    g_replica2 --> ro
+
+    %% App connections
+    gitea -->|"gitea-pg-pooler-rw"| g_bouncer
+    authentik -->|"authentik-db-pooler-rw"| a_bouncer
+    companions -->|"companions-db-pooler-rw"| c_bouncer
+    mlflow -->|"mlflow-db-rw"| m_primary
+
+    classDef operator fill:#e74c3c,color:white
+    classDef primary fill:#3498db,color:white
+    classDef replica fill:#95a5a6,color:white
+    classDef bouncer fill:#9b59b6,color:white
+    classDef storage fill:#27ae60,color:white
+    classDef app fill:#f39c12,color:black
+
+    class cnpg operator
+    class g_primary,a_primary,c_primary,m_primary primary
+    class g_replica1,g_replica2,a_replica1,a_replica2,c_replica1,c_replica2 replica
+    class g_bouncer,a_bouncer,c_bouncer bouncer
+    class longhorn,s3 storage
+    class gitea,authentik,companions,mlflow app
+
+```