feat(task-021): add admin workflow template api

apps/backend/src/infrastructure/schema.py

@@ -17,6 +17,7 @@ from src.domain.contracts import (
     PublishingStatus,
     Role,
     ScriptConfigVersionStatus,
+    WorkflowTemplateStatus,
 )
 
 
@@ -30,6 +31,9 @@ PUBLISHING_STATUS_VALUES = _quoted_values(status.value for status in PublishingS
 SCRIPT_CONFIG_STATUS_VALUES = _quoted_values(
     status.value for status in ScriptConfigVersionStatus
 )
+WORKFLOW_TEMPLATE_STATUS_VALUES = _quoted_values(
+    status.value for status in WorkflowTemplateStatus
+)
 PLAN_REVIEW_STATUS_VALUES = _quoted_values(status.value for status in PlanReviewStatus)
 CLAIM_SUPPORT_STATUS_VALUES = _quoted_values(
     status.value for status in ClaimSupportStatus
@@ -94,6 +98,53 @@ POSTGRES_SCHEMA_STATEMENTS: tuple[str, ...] = (
     )
     """,
     f"""
+    CREATE TABLE IF NOT EXISTS workflow_templates (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        name TEXT NOT NULL,
+        slug TEXT NOT NULL UNIQUE,
+        description TEXT NOT NULL,
+        status TEXT NOT NULL CHECK (status IN ({WORKFLOW_TEMPLATE_STATUS_VALUES})),
+        version INTEGER NOT NULL,
+        created_by UUID NOT NULL REFERENCES users(id),
+        updated_by UUID REFERENCES users(id),
+        created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+        updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+        activated_at TIMESTAMPTZ,
+        archived_at TIMESTAMPTZ
+    )
+    """,
+    """
+    CREATE TABLE IF NOT EXISTS workflow_template_stages (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        workflow_template_id UUID NOT NULL REFERENCES workflow_templates(id) ON DELETE CASCADE,
+        stable_key TEXT NOT NULL,
+        display_name TEXT NOT NULL,
+        description TEXT NOT NULL,
+        position INTEGER NOT NULL,
+        owner_role TEXT NOT NULL CHECK (owner_role IN ('ADMIN', 'EDITOR')),
+        runner_profile_key TEXT NOT NULL,
+        required_inputs JSONB NOT NULL DEFAULT '[]'::jsonb,
+        expected_outputs JSONB NOT NULL DEFAULT '[]'::jsonb,
+        acceptance_criteria JSONB NOT NULL DEFAULT '[]'::jsonb,
+        requires_human_approval BOOLEAN NOT NULL DEFAULT false,
+        retry_policy JSONB NOT NULL DEFAULT '{}'::jsonb,
+        parts JSONB NOT NULL DEFAULT '[]'::jsonb,
+        created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+        updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+        UNIQUE (workflow_template_id, stable_key)
+    )
+    """,
+    f"""
+    CREATE TABLE IF NOT EXISTS workflow_template_events (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        workflow_template_id UUID NOT NULL REFERENCES workflow_templates(id) ON DELETE CASCADE,
+        event_type TEXT NOT NULL,
+        actor_user_id UUID REFERENCES users(id),
+        payload JSONB NOT NULL DEFAULT '{{}}'::jsonb,
+        created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+    )
+    """,
+    f"""
     CREATE TABLE IF NOT EXISTS articles (
         id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
         target_site_id UUID NOT NULL REFERENCES target_sites(id),
@@ -400,6 +451,19 @@ POSTGRES_SCHEMA_STATEMENTS: tuple[str, ...] = (
     )
     """,
     "CREATE INDEX IF NOT EXISTS idx_target_sites_slug ON target_sites (slug)",
+    "CREATE INDEX IF NOT EXISTS idx_workflow_templates_slug ON workflow_templates (slug)",
+    """
+    CREATE INDEX IF NOT EXISTS idx_workflow_templates_status_updated
+    ON workflow_templates (status, updated_at DESC)
+    """,
+    """
+    CREATE INDEX IF NOT EXISTS idx_workflow_template_stages_order
+    ON workflow_template_stages (workflow_template_id, position)
+    """,
+    """
+    CREATE INDEX IF NOT EXISTS idx_workflow_template_events_history
+    ON workflow_template_events (workflow_template_id, created_at)
+    """,
     """
     CREATE INDEX IF NOT EXISTS idx_articles_dashboard
     ON articles (target_site_id, status, publishing_status, updated_at DESC)
@@ -496,6 +560,53 @@ SQLITE_SCHEMA_STATEMENTS: tuple[str, ...] = (
     )
     """,
     """
+    CREATE TABLE IF NOT EXISTS workflow_templates (
+        id TEXT PRIMARY KEY,
+        name TEXT NOT NULL,
+        slug TEXT NOT NULL UNIQUE,
+        description TEXT NOT NULL,
+        status TEXT NOT NULL,
+        version INTEGER NOT NULL,
+        created_by TEXT NOT NULL,
+        updated_by TEXT,
+        created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        activated_at TEXT,
+        archived_at TEXT
+    )
+    """,
+    """
+    CREATE TABLE IF NOT EXISTS workflow_template_stages (
+        id TEXT PRIMARY KEY,
+        workflow_template_id TEXT NOT NULL,
+        stable_key TEXT NOT NULL,
+        display_name TEXT NOT NULL,
+        description TEXT NOT NULL,
+        position INTEGER NOT NULL,
+        owner_role TEXT NOT NULL,
+        runner_profile_key TEXT NOT NULL,
+        required_inputs TEXT NOT NULL DEFAULT '[]',
+        expected_outputs TEXT NOT NULL DEFAULT '[]',
+        acceptance_criteria TEXT NOT NULL DEFAULT '[]',
+        requires_human_approval INTEGER NOT NULL DEFAULT 0,
+        retry_policy TEXT NOT NULL DEFAULT '{}',
+        parts TEXT NOT NULL DEFAULT '[]',
+        created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        UNIQUE (workflow_template_id, stable_key)
+    )
+    """,
+    """
+    CREATE TABLE IF NOT EXISTS workflow_template_events (
+        id TEXT PRIMARY KEY,
+        workflow_template_id TEXT NOT NULL,
+        event_type TEXT NOT NULL,
+        actor_user_id TEXT,
+        payload TEXT NOT NULL DEFAULT '{}',
+        created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    )
+    """,
+    """
     CREATE TABLE IF NOT EXISTS articles (
         id TEXT PRIMARY KEY,
         target_site_id TEXT NOT NULL,
@@ -767,6 +878,19 @@ SQLITE_SCHEMA_STATEMENTS: tuple[str, ...] = (
     )
     """,
     "CREATE INDEX IF NOT EXISTS idx_target_sites_slug ON target_sites (slug)",
+    "CREATE INDEX IF NOT EXISTS idx_workflow_templates_slug ON workflow_templates (slug)",
+    """
+    CREATE INDEX IF NOT EXISTS idx_workflow_templates_status_updated
+    ON workflow_templates (status, updated_at)
+    """,
+    """
+    CREATE INDEX IF NOT EXISTS idx_workflow_template_stages_order
+    ON workflow_template_stages (workflow_template_id, position)
+    """,
+    """
+    CREATE INDEX IF NOT EXISTS idx_workflow_template_events_history
+    ON workflow_template_events (workflow_template_id, created_at)
+    """,
     """
     CREATE INDEX IF NOT EXISTS idx_articles_dashboard
     ON articles (target_site_id, status, publishing_status, updated_at)