-- Content-addressed prefix snapshots (H2 expand).

CREATE TABLE prefix_snapshot (
    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    content_hash  CHAR(64) NOT NULL,
    created_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
    CONSTRAINT prefix_snapshot_hash_uniq UNIQUE (content_hash)
);

CREATE TABLE prefix_snapshot_row (
    snapshot_id   UUID NOT NULL REFERENCES prefix_snapshot (id) ON DELETE CASCADE,
    ord           INTEGER NOT NULL,
    prefix        TEXT NOT NULL,
    community_id  UUID REFERENCES bgp_community (id) ON DELETE SET NULL,
    source        TEXT NOT NULL DEFAULT '',
    PRIMARY KEY (snapshot_id, ord)
);

CREATE INDEX idx_prefix_snapshot_row_snapshot ON prefix_snapshot_row (snapshot_id);

ALTER TABLE config_revision
    ADD COLUMN prefix_snapshot_id UUID REFERENCES prefix_snapshot (id) ON DELETE RESTRICT;