-- #222 (ADR 0023): read-access trail for classified pages. Its own table —
-- volume, purpose and legal basis differ from audit_log. No foreign keys:
-- evidence must survive page purges and hard user deletions unchanged.
-- Partitioning and retention follow in #224.
CREATE TABLE "read_events" (
    "id" TEXT NOT NULL,
    "occurred_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "actor_id" TEXT,
    "session_key" TEXT NOT NULL,
    "page_id" TEXT,
    "pond_id" TEXT NOT NULL,
    "channel" TEXT NOT NULL,
    "classification" TEXT NOT NULL,
    "details" JSONB,

    CONSTRAINT "read_events_pkey" PRIMARY KEY ("id")
);

CREATE INDEX "read_events_page_id_occurred_at_idx" ON "read_events"("page_id", "occurred_at");

CREATE INDEX "read_events_actor_id_occurred_at_idx" ON "read_events"("actor_id", "occurred_at");

CREATE INDEX "read_events_occurred_at_idx" ON "read_events"("occurred_at");