first commit

backend/migrations/036_scheduler_outbox.sql

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+CREATE TABLE IF NOT EXISTS scheduler_outbox (
+    id BIGSERIAL PRIMARY KEY,
+    event_type TEXT NOT NULL,
+    account_id BIGINT NULL,
+    group_id BIGINT NULL,
+    payload JSONB NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_scheduler_outbox_created_at ON scheduler_outbox (created_at);