Why ClickHouseSinkConnector with Debezium PostgresConnector replicates zero values or nulls #182

rsurgiewicz · 2023-09-13T14:20:25Z

rsurgiewicz
Sep 13, 2023

Hi Guys,
I spent a lot of time trying to set up Kafka-connect with debezium connectors (In) to ClickhouseSinkConnector (Sink).

My reference docs were mainly:
https://clickhouse.com/blog/clickhouse-postgresql-change-data-capture-cdc-part-1
https://clickhouse.com/blog/clickhouse-postgresql-change-data-capture-cdc-part-2
https://github.com/ClickHouse/examples/blob/main/cdc/postgresql/connectors/debezium_configuration.json
https://clickhouse.com/docs/en/integrations/kafka#clickhouse-kafka-connect-sink

Despite trying many different configs I got to the point where any operation on source Postgres Table produces a row in Clickhouse with 0 or empty values.

ClickhouseSinkConnector version: 1.0.0| 1.0.1 tested both
DebeziumPostgres connectors version: 2.3 | 2.4 tested both

I'm also not sure (docs are actually inconsistent) whether to use transforms.flatten or not.
Tried both with/without it and there's no change.

My configs (I'm using docker containers with no ssl, dev clickhouse is not exposed at all currently)

Postgres connector:

config": {
    "connector.class": "io.debezium.connector.postgresql.PostgresConnector", 
    "plugin.name": "pgoutput",
    "database.hostname": "xxxx", 
    "database.server.name": "postgres", 
    "database.port": "xxx", 
    "database.user": "xxxx",
    "database.password": "xxxx",
    "database.dbname" : "xxxx", 
    "table.include.list": "public.testradiomeas",
    "topic.prefix": "testprefix",
    "publication.name": "myint_logical_replication",
    "value.converter": "org.apache.kafka.connect.json.JsonConverter",
    "value.converter.schemas.enable": "false",  
    "key.converter": "org.apache.kafka.connect.json.JsonConverter",
    "key.converter.schemas.enable": "false",
    "snapshot.mode": "never",
    "tombstones.on.delete": "false",
    "decimal.handling.mode": "double",
    "transforms": "set_topic,flatten",
    "transforms.flatten.type": "org.apache.kafka.connect.transforms.Flatten$Value",
    "transforms.flatten.delimiter": ".",
    "transforms.set_topic.type": "org.apache.kafka.connect.transforms.RegexRouter",
    "transforms.set_topic.regex": ".*",
    "transforms.set_topic.replacement": "testradiomeas",
    "value.converter.schemas.enable": "false",
    "key.converter.schemas.enable": "false",
    "value.converter": "org.apache.kafka.connect.json.JsonConverter",
    "key.converter": "org.apache.kafka.connect.storage.StringConverter"
}

ClickhouseSinkConnector:

{
   "connector.class": "com.clickhouse.kafka.connect.ClickHouseSinkConnector",
    "tasks.max": "1",
    "database": "default",
    "errors.retry.timeout": "60",
    "exactlyOnce": "false",
    "hostname": "clickhouse",
    "port": "8123",
    "ssl": "false",
    "username": "default",
    "password": "xxxx",
    "topics": "testradiomeas",
    "value.converter": "org.apache.kafka.connect.json.JsonConverter",
    "value.converter.schemas.enable": "false",
    "clickhouseSettings": ""
}

Sample message from PostgresTopic (without flattening)

{
    "before": {
        "measDate": 3,
        "measLongitude": 4.0,
        "measLatitude": 4.0,
        "measNetNoCoverage": 0,
        "measNetType": "4G"
    },
    "after": {
        "measDate": 3,
        "measLongitude": 4.0,
        "measLatitude": 4.0,
        "measNetNoCoverage": 1,
        "measNetType": "4G"
    },
    "source": {
        "version": "2.4.0.Beta2",
        "connector": "postgresql",
        "name": "xxxx",
        "ts_ms": 1694612998884,
        "snapshot": "false",
        "db": "xxxx",
        "sequence": "[\"58089216\",\"58089528\"]",
        "schema": "public",
        "table": "testradiomeas",
        "txId": 728,
        "lsn": 58089528,
        "xmin": null
    },
    "op": "u",
    "ts_ms": 1694612999037,
    "transaction": null
}

Sample message from PostgresTopic (with flattening)

{
    "before.measDate": 3,
    "before.measLongitude": 4.0,
    "before.measLatitude": 4.0,
    "before.measNetNoCoverage": 1,
    "before.measNetType": "4G",
    "after.measDate": 3,
    "after.measLongitude": 4.0,
    "after.measLatitude": 4.0,
    "after.measNetNoCoverage": 0,
    "after.measNetType": "4G",
    "source.version": "2.4.0.Beta2",
    "source.connector": "postgresql",
    "source.name": "gibbonapi",
    "source.ts_ms": 1694614700127,
    "source.snapshot": "false",
    "source.db": "xxxx",
    "source.sequence": "[\"58090632\",\"58090920\"]",
    "source.schema": "public",
    "source.table": "testradiomeas",
    "source.txId": 729,
    "source.lsn": 58090920,
    "source.xmin": null,
    "op": "u",
    "ts_ms": 1694614700664,
    "transaction.id": null,
    "transaction.total_order": null,
    "transaction.data_collection_order": null
}

What could be the reason behind is not replicating correctly
Both source and target table structure is the same.

Thanks!

Answered by Paultagoras

Sep 15, 2023

Hmm, what's interesting is that the first one has null values for before while the second actually fills them in.

"payload": {
    "before.measDate": 3,
    "before.measLongitude": 4.0,
    "before.measLatitude": 2.0,
    "before.measNetNoCoverage": 0,
    "before.measNetType": "4G",
    "after.measDate": 3,
    "after.measLongitude": 4.0,
    "after.measLatitude": 2.0,
    "after.measNetNoCoverage": 0,
    "after.measNetType": "5G",
    "source.version": "2.2.1.Final",
    "source.connector": "postgresql",
    "source.name": "xxxx",
    "source.ts_ms": 1694812097921,
    "source.snapshot": "false",
    "source.db": "xxxx",
    "source.sequence": "[\"58144128\",\"58144184\"]",
    "source…

View full answer

Paultagoras · 2023-09-15T16:23:47Z

Paultagoras
Sep 15, 2023
Maintainer

Hmmm, could you attach the "SHOW CREATE TABLE" so I can see the table structure?

5 replies

rsurgiewicz Sep 15, 2023
Author

Sure

CREATE TABLE default.testradiomeas
(
    `measDate` Int32,
    `masLongitude` Float64,
    `measLatitude` Float64,
    `measNetNoCoverage` Int32,
    `measNetType` String
)
ENGINE = ReplacingMergeTree
ORDER BY (measDate, masLongitude, measLatitude)
SETTINGS index_granularity = 8192

Paultagoras Sep 15, 2023
Maintainer

Ah, I wonder then - could you try adding a column for "before.measLongitude" for instance?

rsurgiewicz Sep 15, 2023
Author

I see your idea, but seems not to work anyways:

create table default.testradiomeas
(
    measDate          Int32,
    masLongitude      Float64,
    measLatitude      Float64,
    measNetNoCoverage Int32,
    measNetType       String,
    "before.measLongitude" Float64
)
    engine = ReplacingMergeTree ORDER BY (measDate,masLongitude,measLatitude)
        SETTINGS index_granularity = 8192;

Paultagoras Sep 15, 2023
Maintainer

Hmm, interesting - let me set up something with a similar data structure to see if I can get more detail out of it.

rsurgiewicz Sep 15, 2023
Author

Just for the curiosity, shall "flatten" transformation be used as described here:
https://clickhouse.com/blog/clickhouse-postgresql-change-data-capture-cdc-part-2
and https://github.com/ClickHouse/examples/blob/main/cdc/postgresql/connectors/debezium_configuration.json

or not?

Paultagoras · 2023-09-15T20:54:24Z

Paultagoras
Sep 15, 2023
Maintainer

How you're flattening looks right - I think I might know what's going on though. Could you try this for the database?

CREATE TABLE default.testradiomeas
(
    `before.measDate` Int32,
    `before.measLongitude` Float64,
    `before.measLatitude` Float64,
    `before.measNetNoCoverage` Int32,
    `before.measNetType` String
)
ENGINE = ReplicatedReplacingMergeTree('/clickhouse/tables/{uuid}/{shard}', '{replica}')
ORDER BY `before.measDate`

9 replies

rsurgiewicz Sep 15, 2023
Author

Table creation works fine but it's still populated with zeros/empty values

+---------------+--------------------+-------------------+------------------------+------------------+
|before.measDate|before.measLongitude|before.measLatitude|before.measNetNoCoverage|before.measNetType|
+---------------+--------------------+-------------------+------------------------+------------------+
|0              |0                   |0                  |0                       |                  |
|0              |0                   |0                  |0                       |                  |
+---------------+--------------------+-------------------+------------------------+------------------+

Paultagoras Sep 15, 2023
Maintainer

Hmm, could I see another sample of the data in the topic? Say the last... 5 messages?

rsurgiewicz Sep 15, 2023
Author

Sure! BTW. Kudos for trying to solve the case :-)

last message (now I tried with schema to check if it helps anyhow)
this is INSERT operation

{
  "schema": {
    "type": "struct",
    "fields": [
      {
        "type": "int64",
        "optional": true,
        "field": "before.measDate"
      },
      {
        "type": "double",
        "optional": true,
        "field": "before.measLongitude"
      },
      {
        "type": "double",
        "optional": true,
        "field": "before.measLatitude"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "before.measNetNoCoverage"
      },
      {
        "type": "string",
        "optional": true,
        "field": "before.measNetType"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "after.measDate"
      },
      {
        "type": "double",
        "optional": true,
        "field": "after.measLongitude"
      },
      {
        "type": "double",
        "optional": true,
        "field": "after.measLatitude"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "after.measNetNoCoverage"
      },
      {
        "type": "string",
        "optional": true,
        "field": "after.measNetType"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.version"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.connector"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.name"
      },
      {
        "type": "int64",
        "optional": false,
        "field": "source.ts_ms"
      },
      {
        "type": "string",
        "optional": true,
        "name": "io.debezium.data.Enum",
        "version": 1,
        "parameters": {
          "allowed": "true,last,false,incremental"
        },
        "default": "false",
        "field": "source.snapshot"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.db"
      },
      {
        "type": "string",
        "optional": true,
        "field": "source.sequence"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.schema"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.table"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "source.txId"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "source.lsn"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "source.xmin"
      },
      {
        "type": "string",
        "optional": false,
        "field": "op"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "ts_ms"
      },
      {
        "type": "string",
        "optional": true,
        "field": "transaction.id"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "transaction.total_order"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "transaction.data_collection_order"
      }
    ],
    "optional": false,
    "name": "noteldb.public.testradiomeas.Envelope",
    "version": 1
  },
  "payload": {
    "before.measDate": null,
    "before.measLongitude": null,
    "before.measLatitude": null,
    "before.measNetNoCoverage": null,
    "before.measNetType": null,
    "after.measDate": 4,
    "after.measLongitude": 5.0,
    "after.measLatitude": 6.0,
    "after.measNetNoCoverage": 7,
    "after.measNetType": "2G",
    "source.version": "2.2.1.Final",
    "source.connector": "postgresql",
    "source.name": "xxx",
    "source.ts_ms": 1694812175838,
    "source.snapshot": "false",
    "source.db": "xxx",
    "source.sequence": "[\"58144376\",\"58144432\"]",
    "source.schema": "public",
    "source.table": "testradiomeas",
    "source.txId": 757,
    "source.lsn": 58144432,
    "source.xmin": null,
    "op": "c",
    "ts_ms": 1694812176570,
    "transaction.id": null,
    "transaction.total_order": null,
    "transaction.data_collection_order": null
  }
}

this is update:

{
  "schema": {
    "type": "struct",
    "fields": [
      {
        "type": "int64",
        "optional": true,
        "field": "before.measDate"
      },
      {
        "type": "double",
        "optional": true,
        "field": "before.measLongitude"
      },
      {
        "type": "double",
        "optional": true,
        "field": "before.measLatitude"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "before.measNetNoCoverage"
      },
      {
        "type": "string",
        "optional": true,
        "field": "before.measNetType"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "after.measDate"
      },
      {
        "type": "double",
        "optional": true,
        "field": "after.measLongitude"
      },
      {
        "type": "double",
        "optional": true,
        "field": "after.measLatitude"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "after.measNetNoCoverage"
      },
      {
        "type": "string",
        "optional": true,
        "field": "after.measNetType"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.version"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.connector"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.name"
      },
      {
        "type": "int64",
        "optional": false,
        "field": "source.ts_ms"
      },
      {
        "type": "string",
        "optional": true,
        "name": "io.debezium.data.Enum",
        "version": 1,
        "parameters": {
          "allowed": "true,last,false,incremental"
        },
        "default": "false",
        "field": "source.snapshot"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.db"
      },
      {
        "type": "string",
        "optional": true,
        "field": "source.sequence"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.schema"
      },
      {
        "type": "string",
        "optional": false,
        "field": "source.table"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "source.txId"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "source.lsn"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "source.xmin"
      },
      {
        "type": "string",
        "optional": false,
        "field": "op"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "ts_ms"
      },
      {
        "type": "string",
        "optional": true,
        "field": "transaction.id"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "transaction.total_order"
      },
      {
        "type": "int64",
        "optional": true,
        "field": "transaction.data_collection_order"
      }
    ],
    "optional": false,
    "name": "noteldb.public.testradiomeas.Envelope",
    "version": 1
  },
  "payload": {
    "before.measDate": 3,
    "before.measLongitude": 4.0,
    "before.measLatitude": 2.0,
    "before.measNetNoCoverage": 0,
    "before.measNetType": "4G",
    "after.measDate": 3,
    "after.measLongitude": 4.0,
    "after.measLatitude": 2.0,
    "after.measNetNoCoverage": 0,
    "after.measNetType": "5G",
    "source.version": "2.2.1.Final",
    "source.connector": "postgresql",
    "source.name": "xxxx",
    "source.ts_ms": 1694812097921,
    "source.snapshot": "false",
    "source.db": "xxxx",
    "source.sequence": "[\"58144128\",\"58144184\"]",
    "source.schema": "public",
    "source.table": "testradiomeas",
    "source.txId": 756,
    "source.lsn": 58144184,
    "source.xmin": null,
    "op": "u",
    "ts_ms": 1694812098061,
    "transaction.id": null,
    "transaction.total_order": null,
    "transaction.data_collection_order": null
  }
}

Paultagoras Sep 15, 2023
Maintainer

Hmm, what's interesting is that the first one has null values for before while the second actually fills them in.

"payload": {
    "before.measDate": 3,
    "before.measLongitude": 4.0,
    "before.measLatitude": 2.0,
    "before.measNetNoCoverage": 0,
    "before.measNetType": "4G",
    "after.measDate": 3,
    "after.measLongitude": 4.0,
    "after.measLatitude": 2.0,
    "after.measNetNoCoverage": 0,
    "after.measNetType": "5G",
    "source.version": "2.2.1.Final",
    "source.connector": "postgresql",
    "source.name": "xxxx",
    "source.ts_ms": 1694812097921,
    "source.snapshot": "false",
    "source.db": "xxxx",
    "source.sequence": "[\"58144128\",\"58144184\"]",
    "source.schema": "public",
    "source.table": "testradiomeas",
    "source.txId": 756,
    "source.lsn": 58144184,
    "source.xmin": null,
    "op": "u",
    "ts_ms": 1694812098061,
    "transaction.id": null,
    "transaction.total_order": null,
    "transaction.data_collection_order": null
  }

That looks like it should be fine (and when I tested it, it inserted no problem) - could you poll a few messages from the kafka topic, just to see what messages are coming in?

Answer selected by Paultagoras

rsurgiewicz Sep 15, 2023
Author

Hmm, what's interesting is that the first one has null values for before while the second actually fills them in.
The first one is INSERT of a new row, therefore there are nulls for "before" stage.

I've setup a isolated local environment so the only messages in this kafka topic are the one that are generated by my manual changes to postgres table and then processed by debezium plugin.

Paultagoras Sep 28, 2023
Maintainer

Just to recap - the flatten mentioned converts the data to the above format. The columns need to reflect this (as in the sample CREATE statement earlier) or else it just uses "default" values.

rsurgiewicz · 2023-09-15T21:25:14Z

rsurgiewicz
Sep 15, 2023
Author

How can I debug the connector plugin ?
I'm just guessing that the problem is either on:

digesting incoming message --> it's not parsed correctly
pushing data to CH --> it's parsed but problem is in commiting to CH table

1 reply

Paultagoras Sep 15, 2023
Maintainer

So the easiest way on the clickhouse-connector side is to enable debugging on the kafka connect instance - CONNECT_LOG4J_LOGGERS: org.apache.zookeeper=ERROR,org.I0Itec.zkclient=ERROR,org.reflections=ERROR,com.clickhouse=DEBUG

Another option is to using https://docs.confluent.io/platform/current/tools/kafkacat-usage.html to view the messages in the topic (separate from the connector) - that would help make sure the data is valid in the queue

rsurgiewicz · 2023-09-15T21:40:30Z

rsurgiewicz
Sep 15, 2023
Author

Ok there's some small breakthrough:

After disabling schema it works with

CREATE TABLE default.testradiomeas
(
    `before.measDate` Int32,
    `before.measLongitude` Float64,
    `before.measLatitude` Float64,
    `before.measNetNoCoverage` Int32,
    `before.measNetType` String
)
ENGINE = MergeTree
ORDER BY `before.measDate`;

or similar with 'after'

So it looks like that sink connector does not interpret after.xxx and before.xxx correctly.

Example here
https://github.com/ClickHouse/examples/blob/main/cdc/postgresql/connectors/debezium_configuration.json
and also article: https://clickhouse.com/blog/clickhouse-postgresql-change-data-capture-cdc-part-2

clearly confirms that "before" "after" fields feature are meant to be used by forcing "after.state.only": "false",

0 replies

elmaghrabii · 2024-04-01T23:07:59Z

elmaghrabii
Apr 1, 2024

Hi,

i have the same issue , please can you help me ?

2 replies

elmaghrabii Apr 1, 2024

on postgres
mag=# insert into mag_tables values (666,'amr',1989);
INSERT 0 1

====================

on kafkak tpoic
{"schema":{"type":"struct","fields":[{"type":"struct","fields":[{"type":"string","optional":true,"field":"id"},{"type":"string","optional":true,"field":"name"},{"type":"int32","optional":true,"field":"no"}],"optional":true,"name":"mag.public.mag_tables.Value","field":"before"},{"type":"struct","fields":[{"type":"string","optional":true,"field":"id"},{"type":"string","optional":true,"field":"name"},{"type":"int32","optional":true,"field":"no"}],"optional":true,"name":"mag.public.mag_tables.Value","field":"after"},{"type":"struct","fields":[{"type":"string","optional":false,"field":"version"},{"type":"string","optional":false,"field":"connector"},{"type":"string","optional":false,"field":"name"},{"type":"int64","optional":false,"field":"ts_ms"},{"type":"string","optional":true,"name":"io.debezium.data.Enum","version":1,"parameters":{"allowed":"true,last,false,incremental"},"default":"false","field":"snapshot"},{"type":"string","optional":false,"field":"db"},{"type":"string","optional":true,"field":"sequence"},{"type":"string","optional":false,"field":"schema"},{"type":"string","optional":false,"field":"table"},{"type":"int64","optional":true,"field":"txId"},{"type":"int64","optional":true,"field":"lsn"},{"type":"int64","optional":true,"field":"xmin"}],"optional":false,"name":"io.debezium.connector.postgresql.Source","field":"source"},{"type":"string","optional":false,"field":"op"},{"type":"int64","optional":true,"field":"ts_ms"},{"type":"struct","fields":[{"type":"string","optional":false,"field":"id"},{"type":"int64","optional":false,"field":"total_order"},{"type":"int64","optional":false,"field":"data_collection_order"}],"optional":true,"name":"event.block","version":1,"field":"transaction"}],"optional":false,"name":"mag.public.mag_tables.Envelope","version":1},"payload":{"before":null,"after":{"id":"666","name":"amr","no":1989},"source":{"version":"2.5.1.Final","connector":"postgresql","name":"mag","ts_ms":1711012855881,"snapshot":"false","db":"mag","sequence":"["26941288","26941576"]","schema":"public","table":"mag_tables","txId":800,"lsn":26941576,"xmin":null},"op":"c","ts_ms":1711012855904,"transaction":null}}
% Reached end of topic mag.public.mag_tables [0] at offset 62

============================

on clickhouse
┌─id─┬─name─┬─no─┐
│ │ │ 0 │

Paultagoras May 28, 2024
Maintainer

Hi @elmaghrabii, I would suggest trying our latest version (1.1.0) to see if that resolves the issue - if it doesn't, please let us know 🙂

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Why ClickHouseSinkConnector with Debezium PostgresConnector replicates zero values or nulls #182

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Why ClickHouseSinkConnector with Debezium PostgresConnector replicates zero values or nulls #182

rsurgiewicz Sep 13, 2023

Replies: 5 comments · 17 replies

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 28, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

Paultagoras Sep 15, 2023 Maintainer

rsurgiewicz Sep 15, 2023 Author

elmaghrabii Apr 1, 2024

elmaghrabii Apr 1, 2024

Paultagoras May 28, 2024 Maintainer

rsurgiewicz
Sep 13, 2023

Replies: 5 comments 17 replies

Paultagoras
Sep 15, 2023
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rsurgiewicz Sep 15, 2023
Author

Paultagoras Sep 15, 2023
Maintainer

rsurgiewicz Sep 15, 2023
Author

Paultagoras Sep 15, 2023
Maintainer

rsurgiewicz Sep 15, 2023
Author

Paultagoras
Sep 15, 2023
Maintainer

rsurgiewicz Sep 15, 2023
Author

Paultagoras Sep 15, 2023
Maintainer

rsurgiewicz Sep 15, 2023
Author

Paultagoras Sep 15, 2023
Maintainer

rsurgiewicz Sep 15, 2023
Author

Paultagoras Sep 28, 2023
Maintainer

rsurgiewicz
Sep 15, 2023
Author

Paultagoras Sep 15, 2023
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rsurgiewicz
Sep 15, 2023
Author

elmaghrabii
Apr 1, 2024

Paultagoras May 28, 2024
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