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-- PostgreSQL CDC Setup for Debezium
-- =============================================================================
-- Enable logical replication wal_level=logical (set in postgresql.conf via Docker)
-- This script creates publication and initial tables for Bronze layer
-- =============================================================================
-- Create publication for CDC (idempotent)
DO $$
BEGIN
IF NOT EXISTS (
SELECT 1 FROM pg_publication WHERE pubname = 'dbz_publication'
) THEN
CREATE PUBLICATION dbz_publication FOR TABLE
raw_orders,
raw_order_items,
raw_customers,
raw_products,
raw_sellers,
raw_payments,
raw_reviews,
raw_geolocation;
END IF;
END $$;
-- Create replication slots (Debezium will create these automatically,
-- but pre-creating with consistent names helps idempotency)
-- Note: Slots are created by Debezium connector config 'slot.name'
-- Ensure tables have primary keys for Debezium
-- (Already defined in init-scripts/postgres/01_init_dw.sql)
-- If adding new tables, ensure:
-- 1. Primary key exists
-- 2. REPLICA IDENTITY FULL for tables without PK (fallback)
ALTER TABLE raw_orders REPLICA IDENTITY FULL;
ALTER TABLE raw_order_items REPLICA IDENTITY FULL;
ALTER TABLE raw_customers REPLICA IDENTITY FULL;
ALTER TABLE raw_products REPLICA IDENTITY FULL;
ALTER TABLE raw_sellers REPLICA IDENTITY FULL;
ALTER TABLE raw_payments REPLICA IDENTITY FULL;
ALTER TABLE raw_reviews REPLICA IDENTITY FULL;
ALTER TABLE raw_geolocation REPLICA IDENTITY FULL;
-- Add CDC metadata columns for tracking (optional but useful)
ALTER TABLE raw_orders ADD COLUMN IF NOT EXISTS _cdc_lsn pg_lsn DEFAULT pg_current_wal_lsn();
ALTER TABLE raw_orders ADD COLUMN IF NOT EXISTS _cdc_ts TIMESTAMPTZ DEFAULT NOW();
-- Create helper function for manual LSN tracking
CREATE OR REPLACE FUNCTION cdc_get_lsn()
RETURNS pg_lsn AS $$
BEGIN
RETURN pg_current_wal_lsn();
END;
$$ LANGUAGE plpgsql SECURITY DEFINER;
-- Grant replication privilege to dw_user (for Debezium connection)
ALTER USER dw_user WITH REPLICATION;
-- Create monitoring view for CDC lag
CREATE OR REPLACE VIEW v_cdc_lag AS
SELECT
slot_name,
confirmed_flush_lsn,
pg_current_wal_lsn() - confirmed_flush_lsn AS lag_bytes
FROM pg_replication_slots
WHERE slot_name LIKE '%slot';
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