Proposed CI/CD Workflow

flowchart TB
    subgraph Dev["1. Development"]
        A[Create feature branch from main]
        B[Open PR targeting main]
        A --> B
    end

    subgraph CIzone["2. CI Validation"]
        C{"CI Job runs
state:modified+ deferred to prod
DAG overlap skips redundant retests
Fan-out capped at +3 if needed"}
    end

    subgraph UATzone["3. UAT (ephemeral only, auto-deploys on CI pass)"]
        D["Ephemeral schema per PR
uat.ct_test_pr_N
isolated validation vs prod baseline"]
        E["On-demand combined schema
uat.ct_test_combined_N_M
only created when another open PR
has DAG overlap with this one"]
        G{"UAT sign-off"}
    end

    subgraph Prodzone["4. Production"]
        H["Merge PR to main
= prod deployment"]
        J["Other open PRs auto-revalidate
only if DAG overlap with merged change"]
    end

    B --> C
    C -->|Pass| D
    C -.->|if DAG overlap with another open PR| E
    D --> G
    E -.-> G
    G -->|Approved| H
    H --> J

    classDef devNode fill:#e3f2fd,stroke:#1976d2,color:#0d47a1
    classDef ciNode fill:#fff8e1,stroke:#f9a825,color:#5d4037
    classDef uatNode fill:#f3e5f5,stroke:#7b1fa2,color:#4a148c
    classDef uatOptional fill:#fbf5fc,stroke:#7b1fa2,color:#4a148c,stroke-dasharray: 5 5
    classDef prodNode fill:#e8f5e9,stroke:#388e3c,color:#1b5e20

    class A,B devNode
    class C ciNode
    class D,G uatNode
    class E uatOptional
    class H,J prodNode