Merge pull request 'Workstream H: Implement VS-03 Approval Workflow' (#23) from feat/H-vs03-approval-workflow into main

Reviewed-on: #23

db/migrations/0036_approval_workflow.sql

@@ -0,0 +1,65 @@
+-- Migration 0036: Approval workflow schema (VS-03)
+-- Creates tables for model activation approval gates with maker-checker separation
+
+IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'approval_proposals' AND table_schema = 'model_operations')
+BEGIN
+    CREATE TABLE model_operations.approval_proposals (
+        id UUID PRIMARY KEY,
+        model_id UUID NOT NULL REFERENCES model_operations.models(id),
+        status VARCHAR(50) NOT NULL,
+        created_by VARCHAR(255) NOT NULL,
+        created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+        justification TEXT NOT NULL,
+        effective_at DATE NOT NULL,
+        proposed_at TIMESTAMPTZ,
+        approved_by VARCHAR(255),
+        approved_at TIMESTAMPTZ,
+        approval_notes TEXT,
+        activated_by VARCHAR(255),
+        activated_at TIMESTAMPTZ,
+        published_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+        revision INT NOT NULL DEFAULT 1,
+        correlation_id UUID NOT NULL
+    );
+
+    CREATE INDEX ix_approval_proposals_model_id ON model_operations.approval_proposals(model_id);
+    CREATE INDEX ix_approval_proposals_status ON model_operations.approval_proposals(status);
+    CREATE INDEX ix_approval_proposals_created_by ON model_operations.approval_proposals(created_by);
+    CREATE INDEX ix_approval_proposals_approved_by ON model_operations.approval_proposals(approved_by);
+    CREATE INDEX ix_approval_proposals_correlation_id ON model_operations.approval_proposals(correlation_id);
+END;
+
+IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'approval_evidence' AND table_schema = 'model_operations')
+BEGIN
+    CREATE TABLE model_operations.approval_evidence (
+        id UUID PRIMARY KEY,
+        approval_proposal_id UUID NOT NULL REFERENCES model_operations.approval_proposals(id),
+        evidence_type VARCHAR(50) NOT NULL,
+        evidence_url TEXT NOT NULL,
+        reviewer_comment TEXT,
+        published_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+        correlation_id UUID NOT NULL
+    );
+
+    CREATE INDEX ix_approval_evidence_proposal_id ON model_operations.approval_evidence(approval_proposal_id);
+    CREATE INDEX ix_approval_evidence_type ON model_operations.approval_evidence(evidence_type);
+    CREATE INDEX ix_approval_evidence_correlation_id ON model_operations.approval_evidence(correlation_id);
+END;
+
+IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'approval_events' AND table_schema = 'model_operations')
+BEGIN
+    CREATE TABLE model_operations.approval_events (
+        id UUID PRIMARY KEY,
+        approval_proposal_id UUID NOT NULL REFERENCES model_operations.approval_proposals(id),
+        event_type VARCHAR(50) NOT NULL,
+        actor_email VARCHAR(255) NOT NULL,
+        event_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+        details JSONB,
+        published_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+        correlation_id UUID NOT NULL
+    );
+
+    CREATE INDEX ix_approval_events_proposal_id ON model_operations.approval_events(approval_proposal_id);
+    CREATE INDEX ix_approval_events_type ON model_operations.approval_events(event_type);
+    CREATE INDEX ix_approval_events_correlation_id ON model_operations.approval_events(correlation_id);
+END;