v1

.gitignore

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+# Python virtual environment
+venv/
+.venv/
+
+# Python cache
+__pycache__/
+*.pyc
+
+# Environment/secrets
+.env
+
+# IDE
+.vscode/
+.idea/

comp.txt

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+| Company / Product                                                                | True active-active writes | Multi-master                    | Conflict handling                        | Monitoring / dashboard | Standard PostgreSQL?          | My view                                               |
+| -------------------------------------------------------------------------------- | ------------------------- | ------------------------------- | ---------------------------------------- | ---------------------- | ----------------------------- | ----------------------------------------------------- |
+| [pgEdge](https://www.pgedge.com/?utm_source=chatgpt.com)                         | ✅                         | ✅                               | ✅                                        | ✅                      | ✅                             | **Excellent fit**                                     |
+| [EDB Postgres Distributed](https://www.enterprisedb.com/?utm_source=chatgpt.com) | ✅                         | ✅                               | ✅ Advanced                               | ✅ PEM                  | ✅ PostgreSQL-based            | **Enterprise-grade**                                  |
+| [MyDBOps](https://www.mydbops.com/?utm_source=chatgpt.com)                       | ⚠️ Can design/manage      | ⚠️ Depends on technology        | Depends                                  | ✅                      | ✅                             | **Service/consulting provider**                       |
+| Percona                                                                          | ⚠️ PostgreSQL HA focus    | Not its main PostgreSQL product | —                                        | ✅ PMM                  | ✅                             | Better for HA/monitoring than true multi-master       |
+| YugabyteDB                                                                       | ✅                         | ✅ distributed                   | ✅                                        | ✅                      | ⚠️ PostgreSQL-compatible      | Excellent distributed DB, but not ordinary PostgreSQL |
+| CockroachDB                                                                      | ✅                         | ✅ distributed                   | Built into distributed transaction model | ✅                      | ⚠️ PostgreSQL wire compatible | Same caveat: not actual PostgreSQL                    |

instructions.txt

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+Let's make a logger.
+
+CREATE TABLE ddl_history (
+    id BIGSERIAL PRIMARY KEY,
+    event_time TIMESTAMPTZ DEFAULT now(),
+    command TEXT,
+    object_type TEXT,
+    object_name TEXT
+);
+
+Create the function:
+
+CREATE OR REPLACE FUNCTION capture_ddl()
+RETURNS event_trigger
+LANGUAGE plpgsql
+AS $$
+BEGIN
+    INSERT INTO ddl_history (
+        command,
+        object_type,
+        object_name
+    )
+    SELECT
+        TG_TAG,
+        object_type,
+        object_identity
+    FROM pg_event_trigger_ddl_commands();
+END;
+$$;
+
+DROP TABLE
+
+CREATE OR REPLACE FUNCTION capture_drop()
+RETURNS event_trigger
+LANGUAGE plpgsql
+AS $$
+BEGIN
+    INSERT INTO ddl_log (
+        event_time,
+        command,
+        object_type,
+        object_name
+    )
+    SELECT
+        now(),
+        TG_TAG,
+        object_type,
+        object_identity
+    FROM pg_event_trigger_dropped_objects();
+END;
+$$;
+
+
+Create the trigger:
+
+CREATE EVENT TRIGGER capture_ddl_trigger
+ON ddl_command_end
+EXECUTE FUNCTION capture_ddl();
+
+Now test:
+
+CREATE TABLE products (
+    id INT PRIMARY KEY,
+    name TEXT
+);
+
+Check:
+
+SELECT * FROM ddl_history;
+
+
+
+docker-compose.yml for LOGICAL REPLICATION MODE
+
+services:
+  postgres:
+    image: postgres:15
+    container_name: cluster1Node1
+
+    restart: unless-stopped
+
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: postgres
+
+    ports:
+      - "5444:5432"
+
+    volumes:
+      - ./postgres_data:/var/lib/postgresql/data
+
+    command:
+      - postgres
+      - -c
+      - wal_level=logical
+      - -c
+      - max_replication_slots=10
+      - -c
+      - max_wal_senders=10
+
+
+sudo docker compose down
+sudo docker compose up -d
+
+
+SHOW wal_level;
+
+psql -h 172.16.10.123 -p 5444 -U postgres
+
+SHOW max_replication_slots;
+SHOW max_wal_senders;
+
+
+CREATE TABLE users (
+    id INT PRIMARY KEY,
+    name TEXT
+);
+
+
+SELECT *
+FROM pg_create_logical_replication_slot(
+    'myslot',
+    'test_decoding'
+);
+
+INSERT INTO users VALUES (1, 'Alice');
+
+SELECT *
+FROM pg_logical_slot_peek_changes(
+    'myslot',
+    NULL,
+    NULL
+);
+
+
+|===================================================|
+| psql -h 127.0.0.1 -p 5444 -U postgres -d postgres |
+|===================================================|
+command:
+  - postgres
+  - -c
+  - wal_level=logical
+  - -c
+  - shared_preload_libraries=spock
+  - -c
+  - max_replication_slots=10
+  - -c
+  - max_wal_senders=10
+  - -c
+  - track_commit_timestamp=on
+  
+psql -h 127.0.0.1 -p 5444 -U postgres -d postgres
+
+sudo nano postgres_data/pg_hba.conf
+
+host    all    all    172.19.0.0/16    scram-sha-256
+host    all    all    172.16.10.0/24    scram-sha-256
+
+sudo docker exec -it cluster1Node1 psql -U postgres -d postgres
+ALTER USER postgres WITH PASSWORD 'postgres';
+
+sudo docker exec -it cluster1Node3 bash
+psql -U postgres -c "SHOW hba_file;"
+psql -U postgres -c "SELECT pg_reload_conf();"
+
+
+
+
+
+|==========|
+|LINK Nodes|
+|==========|
+SELECT spock.sub_create(
+    subscription_name := 'node2_from_node1',
+    provider_dsn := 'host=172.16.10.123 port=5444 dbname=postgres user=postgres password=postgres'
+);
+
+|=============|
+|Register Node|
+|=============|
+psql -h localhost -p 5444 -U postgres -d postgres
+CREATE EXTENSION IF NOT EXISTS spock;
+SELECT extname, extversion
+FROM pg_extension
+WHERE extname = 'spock';
+SELECT spock.node_create(
+    node_name := 'node1',
+    dsn := 'host=172.16.10.123 port=5444 dbname=postgres user=postgres password=postgres'
+);
+SELECT * FROM spock.node;
+
+|================|
+| CREATE A table |
+|================|
+CREATE TABLE test_replication (
+    id bigint PRIMARY KEY,
+    source_node text,
+    message text
+);
+
+SELECT spock.repset_add_table(
+    'default',
+    'test_replication'
+);
+
+|===========|
+|Turn On DDL|
+|===========|
+
+CREATE TABLE customers (
+    id bigint PRIMARY KEY,
+    name text
+);
+ALTER SYSTEM SET spock.enable_ddl_replication = on;
+ALTER SYSTEM SET spock.include_ddl_repset = on;
+
+SELECT pg_reload_conf();
+
+SHOW spock.enable_ddl_replication;
+SHOW spock.include_ddl_repset;
+
+|======================================================|
+| HOW TO INSERT OR PUT AUTO GEN OF ID IN EXISTING TABLE|
+|======================================================|
+ALTER TABLE test_replication
+ALTER COLUMN id ADD GENERATED BY DEFAULT AS IDENTITY;
+
+
+HOW TO UPADE A NODE CONFIG
+
+UPDATE spock.local_node
+SET node_local_interface = (
+    SELECT if_id
+    FROM spock.node_interface
+    WHERE if_name = 'node2_local'
+      AND if_nodeid = 13534
+);

main.py

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+import psycopg2
+
+# ===== TEST DATA =====
+# id = 600
+source_node = "node1"
+message = "from python with love "
+
+conn = None
+
+try:
+    conn = psycopg2.connect(
+        host="172.16.10.123",
+        port=5444,
+        database="postgres",
+        user="postgres",
+        password="postgres"
+    )
+
+
+    cursor = conn.cursor()
+
+    cursor.execute("""
+        INSERT INTO test_replication (source_node, message)
+        VALUES (%s, %s)
+        RETURNING id
+    """, (source_node, message))
+
+    # Get the ID generated by PostgreSQL
+    generated_id = cursor.fetchone()[0]
+
+    conn.commit()
+
+    print("LOCAL COMMIT: SUCCESS")
+    print("Generated ID:", generated_id)
+    print("Source:", source_node)
+    print("Message:", message)
+
+except Exception as e:
+    if conn:
+        conn.rollback()
+
+    print("LOCAL COMMIT: FAILED")
+    print("Error:", e)
+
+finally:
+    if conn:
+        conn.close()

pgedge.txt

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+SELECT * FROM spock.node;
+output
+ node_id | node_name | location | country | info
+---------+-----------+----------+---------+------
+ 30830   | node1     |          |         |
+
+
+SELECT * FROM spock.node_interface;
+output
+
+   if_id    | if_name | if_nodeid |                                    if_dsn                                    
+------------+---------+-----------+------------------------------------------------------------------------------
+ 2198842153 | node3   |     57454 | host=172.16.10.178 port=5444 dbname=postgres user=postgres password=postgres
+ 2256866226 | node1   |     30830 | host=172.16.10.123 port=5444 dbname=postgres user=postgres password=postgres
+(2 rows)
+
+SELECT * FROM spock.sub_show_status();
+output 
+| Field                 | Value                                |
+| --------------------- | ------------------------------------ |
+| **Subscription Name** | `sub_node2_from_node1`               |
+| **Status**            | `replicating`                        |
+| **Provider Node**     | `node1`                              |
+| **Provider Host**     | `172.16.10.123`                      |
+| **Provider Port**     | `5444`                               |
+| **Database**          | `postgres`                           |
+| **User**              | `postgres`                           |
+| **Password**          | `postgres`                           |
+| **Slot Name**         | `spk_postgres_node1_sub_nodedd485a4` |
+| **Replication Sets**  | `{default}`                          |
+| **Forward Origins**   | empty                                |
+

prometheus/docker-compose.yml

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+services:
+  prometheus:
+    image: prom/prometheus:v3.13.2
+    container_name: prometheus
+    restart: unless-stopped
+
+    ports:
+      - "9090:9090"
+
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
+      - prometheus_data:/prometheus
+
+    command:
+      - "--config.file=/etc/prometheus/prometheus.yml"
+      - "--storage.tsdb.path=/prometheus"
+
+volumes:
+  prometheus_data:

requirements.txt

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+psycopg==3.3.4
+psycopg-binary==3.3.4
+typing_extensions==4.16.0