-- Migration 014: v0.22.2 — Routing Policies
-- Adds routing_policies table for rules-based provider routing.

CREATE TABLE IF NOT EXISTS routing_policies (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name            VARCHAR(200) NOT NULL,
    scope           VARCHAR(10) NOT NULL DEFAULT 'global'
                    CHECK (scope IN ('global', 'team')),
    team_id         UUID REFERENCES teams(id) ON DELETE CASCADE,
    priority        INTEGER NOT NULL DEFAULT 100,
    policy_type     VARCHAR(30) NOT NULL
                    CHECK (policy_type IN ('provider_prefer', 'team_route', 'cost_limit', 'model_alias')),
    config          JSONB NOT NULL DEFAULT '{}'::jsonb,
    is_active       BOOLEAN NOT NULL DEFAULT true,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_routing_policies_active
    ON routing_policies(is_active, priority) WHERE is_active = true;
CREATE INDEX IF NOT EXISTS idx_routing_policies_team
    ON routing_policies(team_id) WHERE team_id IS NOT NULL;

-- Trigger for updated_at
CREATE TRIGGER routing_policies_updated_at
    BEFORE UPDATE ON routing_policies
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

-- Add routing_decision column to usage_log for observability.
ALTER TABLE usage_log
    ADD COLUMN IF NOT EXISTS routing_decision JSONB;