Remove all PostgreSQL compatibility documentation and references (#31978)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: asmyasnikov <14202262+asmyasnikov@users.noreply.github.com>

Author: Copilot

ydb/docs/en/core/changelog-cli.md

@@ -272,7 +272,6 @@ Released on November 26, 2024. To update to version **2.16.0**, select the [Down
 * Added support for [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601)–formatted timestamps in the `{{ ydb-cli }} topic` commands.
 * Added the `--explain-ast` option to the `{{ ydb-cli }} sql` command, which prints the query AST.
 * Added ANSI SQL syntax highlighting in interactive mode.
-* Added support for [PostgreSQL syntax](./postgresql/intro.md) in the `{{ ydb-cli }} workload tpch` and `{{ ydb-cli }} workload tpcds` benchmarks.
 * Introduced the `-c` option for the `{{ ydb-cli }} workload tpcds run` command to compare results with expected values and display differences.
 * Added log events for the `{{ ydb-cli }} tools dump` and `{{ ydb-cli }} tools restore` commands.
 * Enhanced the `{{ ydb-cli }} tools restore` command to display error locations.
@@ -342,7 +341,6 @@ Released on January 12, 2024. To update to version **2.8.0**, select the [Downlo
 ### Features
 
 * Added new `{{ ydb-cli }} admin config` and `{{ ydb-cli }} admin volatile-config` commands for cluster configuration management.
-* Added support for loading PostgreSQL-compatible data types by [ydb import file csv|tsv|json](reference/ydb-cli/export-import/import-file.md) command. Only for row-oriented tables.
 * Added support for directory load from an S3-compatible storage in the [ydb import s3](reference/ydb-cli/export-import/import-s3.md) command. Currently only available on Linux and Mac OS.
 * Added support for outputting the results of [ydb table query execute](reference/ydb-cli/table-query-execute.md), [ydb yql](reference/ydb-cli/yql.md) and [ydb scripting yql](reference/ydb-cli/scripting-yql.md) commands in the [Apache Parquet](https://parquet.apache.org/docs/) format.
 * In the [ydb workload](reference/ydb-cli/commands/workload/index.md) commands, the `--executer` option has been added, which allows to specify which type of queries to use.
@@ -354,15 +352,12 @@ Released on January 12, 2024. To update to version **2.8.0**, select the [Downlo
 
 * Fixed an error displaying tables in `pretty` format with [Unicode](https://en.wikipedia.org/wiki/Unicode) characters.
 
-* Fixed an error substituting the wrong primary key in the command [ydb tools pg-convert](postgresql/import.md#pg-convert).
-
 ## Version 2.7.0 {#2-7-0}
 
 Released on October 23, 2023. To update to version **2.7.0**, select the [Downloads](downloads/ydb-cli.md) section.
 
 ### Features
 
-* Added the [ydb tools pg-convert](postgresql/import.md#pg-convert) command, which prepares a dump obtained by the [pg_dump](https://www.postgresql.org/docs/current/app-pgdump.html) utility for loading into the YDB postgres-compatible layer.
 * Added the `{{ ydb-cli }} workload query` load testing command, which loads the database with [script execution queries](reference/ydb-cli/yql.md) in multiple threads.
 * Added new `{{ ydb-cli }} scheme permissions list` command to list permissions.
 * In the commands [ydb table query execute](reference/ydb-cli/table-query-execute.md), [ydb table query explain](reference/ydb-cli/commands/explain-plan.md), [ydb yql](reference/ydb-cli/yql.md), and [ydb scripting yql](reference/ydb-cli/scripting-yql.md), the `--flame-graph` option has been added, specifying the path to the file in which you need to save the visualization of query execution statistics.

ydb/docs/en/core/dev/getting-started.md

@@ -11,36 +11,27 @@ In parallel with designing the schema, you need to set up your development envir
 Choose the {{ ydb-short-name }} API you want to use; there are several options:
 
 - The recommended way for mainstream programming languages is using a [{{ ydb-short-name }} SDK](../reference/ydb-sdk/index.md). They provide high-level APIs and implement best practices on working with {{ ydb-short-name }}. {{ ydb-short-name }} SDKs are available for several popular languages and strive for feature parity, but not all are feature-complete. Refer to the [SDK feature comparison table](../reference/ydb-sdk/feature-parity.md) to check if the SDK for the programming language you had in mind will fit your needs or to choose a programming language with better feature coverage if you're flexible.
-- Alternatively, {{ ydb-short-name }} provides [PostgreSQL-compatible API](../postgresql/intro.md). It is intended to simplify migrating existing applications that have outgrown PostgreSQL. However, it is also useful for exotic programming languages that have a PostgreSQL client library but don't have a {{ ydb-short-name }} SDK. Refer to PostgreSQL compatibility documentation to check if its completeness will suit your needs.
 - If you are interested in [{{ ydb-short-name }} topics](../concepts/datamodel/topic.md) feature, it is worth noting that they also provide [Kafka-compatible API](../reference/kafka-api/index.md). Follow that link if this use case is relevant.
 - As a last resort, {{ ydb-short-name }}'s native API is based on the [gRPC](https://grpc.io/) protocol, which has an ecosystem around it, including code generation of clients. [{{ ydb-short-name}}'s gRPC specs are hosted on GitHub](https://github.com/ydb-platform/ydb/tree/main/ydb/public/api/grpc) and you could leverage them in your application. The generated clients are low-level and will require extra work to handle aspects like retries and timeouts properly, so go this route only if other options above aren't possible and you know what you're doing.
 
 ## Install prerequisites
 
-Choose the specific programming language you'll be using. [Install the respective {{ ydb-short-name }} SDK](../reference/ydb-sdk/index.md) or [a PostgreSQL driver](https://wiki.postgresql.org/wiki/List_of_drivers) depending on the route you have chosen above.
+Choose the specific programming language you'll be using. [Install the respective {{ ydb-short-name }} SDK](../reference/ydb-sdk/index.md).
 
 Additionally, you'd want to set up at least one of the available ways to run ad-hoc queries for debugging purposes. Choose at least one according to your preferences:
 
 * [{{ ydb-short-name }} CLI](../reference/ydb-cli/install.md)
 * [Embedded UI](../reference/embedded-ui/index.md)
 * Any SQL IDE that supports [JDBC](https://github.com/ydb-platform/ydb-jdbc-driver)
-* [psql](https://www.postgresql.org/docs/14/app-psql.html) or [pgAdmin](https://www.pgadmin.org/) for the PostgreSQL-compatible route.
 
 ## Start coding
 
-### For {{ ydb-short-name }} SDK route
-
 - Go through [YQL tutorial](yql-tutorial/index.md) to get familiar with {{ ydb-short-name }}'s SQL dialect.
 - Explore [example applications](example-app/index.md) to see how working with SDK's looks like.
 - Check out [SDK recipies](../recipes/ydb-sdk/index.md) for typical SDK use cases, which you can refer to later.
 - Learn how to [handle {{ ydb-short-name }} SDK errors](../reference/ydb-sdk/error_handling.md).
 - Leverage your IDE capabilities to navigate the SDK code.
 
-### For PostgreSQL-compatibility route
-
-- Learn how to [connect PostgreSQL driver with {{ ydb-short-name }} cluster](../postgresql/docker-connect.md).
-- The rest should be similar to using vanilla PostgreSQL. Use your experience with it or refer to any favorite resources. However, refer to the list of [functions](../postgresql/functions.md) and statements to adjust your expectations.
-
 ## Testing
 
 To write tests on applications working with {{ ydb-short-name }}:

ydb/docs/en/core/dev/index.md

@@ -24,7 +24,6 @@ Main resources:
   - [{#T}](../yql/reference/index.md)
   - [{#T}](../reference/ydb-sdk/index.md)
   - [{#T}](../reference/ydb-cli/index.md)
-  - [{#T}](../postgresql/intro.md)
   - [{#T}](../reference/kafka-api/index.md)
 
 If you're interested in developing {{ ydb-short-name }} core or satellite projects, refer to the [documentation for contributors](../contributor/index.md).

ydb/docs/en/core/index.yaml

@@ -34,9 +34,6 @@ links:
   - title: Working with the SDK
     description: YDB SDK reference
     href: reference/ydb-sdk/
-  - title: PostgreSQL compatibility
-    description: Integrate with PostgreSQL ecosystem
-    href: postgresql/intro/
   - title: Troubleshooting
     description: Troubleshooting issues related to YDB databases and applications
     href: troubleshooting/

ydb/docs/en/core/integrations/index.md

@@ -4,7 +4,7 @@ This section provides the main information about {{ ydb-name }} integrations wit
 
 {% note info %}
 
-In addition to its own native protocol, {{ ydb-name }} has a compatibility layer that allows external systems to connect to databases via network protocols PostgreSQL or Apache Kafka. Due to the compatibility layer, many tools designed to work with these systems can also interact with {{ ydb-name }}. The compatibility level of each specific application needs to be clarified separately.
+In addition to its own native protocol, {{ ydb-name }} has a compatibility layer that allows external systems to connect to databases via the Apache Kafka network protocol. Due to the compatibility layer, many tools designed to work with Apache Kafka can also interact with {{ ydb-name }}. The compatibility level of each specific application needs to be clarified separately.
 
 {% endnote %}
 
@@ -44,5 +44,4 @@ In addition to its own native protocol, {{ ydb-name }} has a compatibility layer
 ## See also
 
 * [{#T}](../reference/ydb-sdk/index.md)
-* [{#T}](../postgresql/intro.md)
 * [{#T}](../reference/kafka-api/index.md)

ydb/docs/en/core/integrations/visualization/_includes/toc-table.md

@@ -4,5 +4,4 @@
 | --- | :---: | --- |
 | [Apache Superset](https://superset.apache.org) | [ydb-sqlalchemy](https://github.com/ydb-platform/ydb-sqlalchemy/releases) | [Instruction](../superset.md) |
 | [DataLens](https://datalens.tech) | Full | [Instruction](../datalens.md) |
-| [FineBI](https://intl.finebi.com/) | [PostgreSQL wire protocol](../../../postgresql/intro.md) | [Instruction](../finebi.md) |
 | [Grafana](https://grafana.com) | Full | [Instruction](../grafana.md) |

ydb/docs/en/core/integrations/visualization/finebi.md

@@ -32,17 +32,6 @@ grpc_config:
    ca: "/opt/ydb/certs/ca.crt"
 ```
 
-### PostgreSQL Wire Protocol
-
-{{ ydb-short-name }} exposes a separate network port for the [PostgreSQL wire protocol](../../postgresql/intro.md). This protocol is used for external communication with client applications initially designed to work with [PostgreSQL](https://www.postgresql.org/).
-
-Example of enabling TLS for the PostgreSQL wire protocol:
-
-```yaml
-local_pg_wire_config:
-    ssl_certificate: "/opt/ydb/certs/node.crt"
-```
-
 ### Kafka Wire Protocol
 
 {{ ydb-short-name }} exposes a separate network port for the [Kafka wire protocol](../../reference/kafka-api/index.md). This protocol is used for external communication with client applications initially designed to work with [Apache Kafka](https://kafka.apache.org/).

ydb/docs/en/core/reference/configuration/tls.md

@@ -3,7 +3,6 @@
 This documentation section contains reference information about various aspects of {{ ydb-short-name }}, including:
 
 * [{#T}](../yql/reference/index.md)
-* [{#T}](../postgresql/intro.md)
 * [{#T}](./embedded-ui/index.md)
 * [{#T}](../integrations/index.md)
 * [{#T}](./ydb-cli/index.md)

ydb/docs/en/core/reference/index.md

@@ -6,7 +6,6 @@ As {{ ydb-short-name }} is a distributed system typically running on a cluster,
 * {{ ydb-short-name }} as a server:
 
   * [gRPC](../../reference/ydb-sdk/overview-grpc-api.md) for external communication with client applications designed to work natively with {{ ydb-short-name }} via the [SDK](../../reference/ydb-sdk/index.md) or [CLI](../../reference/ydb-cli/index.md).
-  * [PostgreSQL wire protocol](../../postgresql/intro.md) for external communication with client applications initially designed to work with [PostgreSQL](https://www.postgresql.org/).
   * [Kafka wire protocol](../../reference/kafka-api/index.md) for external communication with client applications initially designed to work with [Apache Kafka](https://kafka.apache.org/).
   * HTTP for running the [Embedded UI](../../reference/embedded-ui/index.md), exposing [metrics](../../devops/observability/monitoring.md), and other miscellaneous endpoints.