테스트용 앱 세팅

.gitignore

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+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Kotlin ###
+.kotlin

README.md

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+모든 설명들은 [docopt 표기법](http://docopt.org/) 을 사용하였습니다.
+- <CONSTANTS>: 상수
+- (set|remove): 상호 배타 요소
+- [<OPTIONAL_ARGUMENTS>]: 선택적 요소
+
+## 작업 순서
+
+### feature 브랜치 생성
+
+- gitflow 방식에 의해 develop 브랜치로부터 feature 브랜치 생성
+- feature 브랜치 명명 규칙: `feature/(postgres | assign-redshift | device-redshift)-v<MAJOR_VERSION_NUMBER>[-<MINOR_VERSION_NUMBER>]`
+  - `v` 는 소문자
+  - changelog 버젼 충동을 방지하기 위함
+  - 명명 규칙에 의거하여 리모트 레파지토리에 먼저 올린 브랜치가 버젼 선점에 대한 우선권을 갖습니다.
+
+### [DDL(Data Definition Language) 체인지 로그 파일 gernerate] 
+
+-JPA 엔티티 변경 후 XXXX 태스크 사용
+  - 자신이 작업한 내용만 남기고 다른 내용은 제거
+- generate 된 파일의 버젼 번호와 작업이름을 수정
+- DB 변경을 수동으로 작업한 이후 generateChangelog 태스크를 사용
+  - 자신이 작업한 내용만 남기고 다른 내용은 제거
+  - generate 된 파일의 버젼 번호와 작업이름을 수정
+
+### changelog 파일 생성하거나 generate 된 파일 변경
+
+- 위치: `src/main/resources/(postgres | assign-redshift | device-redshift)/changelog`
+- 파일 형식: `v<MAJOR_VERSION_NUMBER>[.<MINOR_VERSION_NUMBER>]__(ddl | dml)__<NAME>.yaml`
+  - `v` 는 소문자
+  - `_` 가 2개임
+  - <MAJOR_VERSION_NUMBER>: 작업의 첫번째 경우에 develop 에 push 된 이전 메이져 버젼에서 증분하여 사용
+  - <MINOR_VERSION_NUMBER>: 이전 작업에서 추가되는 경우 마이너 버젼을 붙여 사용
+  - ddl: (create | alter | drop) (table | column) 한 경우 선택
+  - dml: insert, update, delete, truncate 등 데이터 수정시 선택 
+  - <NAME>: lower-kebab-case 형태로 작업을 간략하게 표현
+
+### feature 브랜치 commit & push
+
+- commit log 는 반드시 일감 번호로 시작해야 합니다.
+
+### merge develop
+
+- 코드리뷰를 통해 develop 에 병합되어야 합니다.
+- develop 에 병합된 소스는 매일 자정에 devdb 초기화 이후 자동반영됩니다.
+- 그러므로 코드리뷰를 통하지 않은 SQL 오류와 테스트/개발 환경의 오류는 작업자 본인의 책임입니다.
+
+### apm-stage 에 반영
+
+```shell
+./gradlew update --db (postgres | assign-redshift | device-redshift) --profile (apm-dev | skb-stage | skb-prod | uplus-prod | flower-prod)
+```
+
+### changelog 파일에 태그 달기(작업 후 필수)
+      * major version: 테이블을 추가하거나 삭제한 경우 major version 을 올린다.
+      * minor version: alter 의 경우에는 minor version 을 올린다.
+
+
+
+
+
+1. database.yaml 을 참고하여 각 프로파일별로 변경내용 적용
+    * generateChangelog 를 통하여 체인지로그 파일을 생성하였고 변경내용을 적용하려는 프로파일이 수동으로 작업한 곳이라면 changelogSync 태스크 수행 (update 태스크 필요 없음)
+    1. updateSQL 태스크로 DB 에 실제로 적용되는 SQL 문을 확인
+    1. update 태스크로 체인지로그의 변경내용을 실제로 적용
+
+## Commands
+liquibase task 이름의 작명규칙이 있다. 아래의 규칙을 미리 알면 사용이 더욱 쉽다.
+* 뒤가 ChangeLog 로 끝나면 결과는 changeLog 파일로 생성된다.
+    * diffChangeLog
+    * generateChangelog
+* SQL 로 끝나면 sql 문을 아웃풋으로 뿌려준다.
+    * changelogSyncSQL
+    * updateSQL
+    * rollbackSQL
+    * 이하 생략
+* SQL 로 끝나는 task 를 SQL 을 빼고 실행하면 아웃풋으로 뿌려주던 SQL 문의 내용이 실행되어 DB 에 반영된다. 그러므로 실제 반영 전 SQL 을 붙여 반영될 작업의 결과를 확인하고 반영하는 것이 좋을 듯하다.
+
+### generateChangelog
+DB의 모든 테이블 스키마를 읽어와 liquibase 에서 제공하는 DSL 이나 sql 로 변환한다. gradle.properties 의 generateChangeLogFile 에 설정한 이름대로 저장된다.
+```bash
+./gradlew generateChangelog -Dprofile=mysql-dev
+```
+
+### changelogSyncSQL
+changelogSync 태스크를 실행할 때 실제 수행될 SQL 문을 출력한다.
+```bash
+./gradlew changelogSyncSQL -Dprofile=mysql-local
+```
+
+### changelogSync
+DATABASECHANGELOG 테이블을 갱신한다. 데이터베이스를 수동으로 업데이트 한 경우에 유용하다.
+```bash
+./gradlew changelogSync -Dprofile=mysql-local
+```
+
+### updateSQL
+DB 의 적용될 사항을 sql 로 보여준다.
+```bash
+./gradlew updateSQL -Dprofile=mysql-local
+```
+
+### update
+실제 변경을 적용할 경우 사용하는 명령. 데이터는 삭제되지 않으나 컬럼 추가/변경/삭제 등을 할 경우 change-logs 에 마이그레이션을 위한 update 문이 포함되어야 할 수도 있다.
+```bash
+./gradlew update -Dprofile=mysql-local
+```
+
+### diff
+profile 과 referenceProfile DB 의 차이점을 보여준다.
+새로운 변경사항이 적용된 referenceProfile 을 이전 버젼의 profile 과 비교하여 스키마의 차이점을 찾는다.
+```bash
+./gradlew diff -Dprofile=mysql-dev -DreferenceProfile=mysql-local
+```
+
+### diffChangeLog
+profile 과 referenceProfile DB 의 차이점을 찾아 ChangeLog 로 만들어준다. gradle.properties 의 diffChangeLogFile 에 설정한 이름대로 저장된다.
+diffChangeLog 의 정확도가 조금 약하다. 그러므로, diffChangeLogFile 에서 실제로 수정된 것만 추려내는 작업이 필요할 수도 있다.
+새로운 변경사항이 적용된 referenceProfile 을 이전 버젼의 profile 과 비교하여 스키마의 차이점을 찾는다.
+```bash
+./gradlew diffChangeLog -Dprofile=mysql-dev -DreferenceProfile=mysql-local
+```
+
+### rollbackSQL
+태그를 지정하여 롤백 시 수행될 쿼리를 볼 수 있다.
+```bash
+./gradlew rollbackSQL -Dprofile=mysql-local -PliquibaseCommandValue=V1.0 
+```
+
+### rollback
+태그를 지정하여 롤백 가능하다.
+```bash
+./gradlew rollback -Dprofile=mysql-local -PliquibaseCommandValue=V1.0 
+```
+
+### clearCheckSums
+수정시 파일이 바뀌어 체크섬을 다시 계산해야 되는 경우 위 명령을 실행하고 update 나 changelogSync 등을 실행
+```bash
+./gradlew clearCheckSums -Dprofile=mysql-local
+```
+
+### dbDoc
+javadoc 스타일로 현재 DB 적용 상태를 문서로 만들어준다.
+```bash
+./gradlew dbDoc -Dprofile=mysql-local
+```
+
+### tasks
+모든 tasks 를 볼려면
+```bash
+./gradlew tasks
+```

build.gradle.kts

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+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    id("org.springframework.boot") version "3.2.2"
+    id("io.spring.dependency-management") version "1.1.4"
+    kotlin("jvm") version "1.9.22"
+    kotlin("plugin.spring") version "1.9.22"
+    kotlin("plugin.jpa") version "1.9.22"
+
+    id("org.liquibase.gradle") version "2.2.1"
+}
+
+group = "com.example"
+version = "0.0.1-SNAPSHOT"
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_21
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.springframework.boot:spring-boot-starter-validation")
+
+    liquibaseRuntime("org.liquibase:liquibase-core")
+    liquibaseRuntime("org.liquibase.ext:liquibase-hibernate6:4.25.1")
+    liquibaseRuntime("com.h2database:h2")
+    liquibaseRuntime("org.postgresql:postgresql")
+
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+}
+
+liquibase {
+    activities.register("postgres") {
+        this.arguments = mapOf("changeLogFile" to "src/main/resources/postgres/dev.yaml")
+    }
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions {
+        freeCompilerArgs += "-Xjsr305=strict"
+        jvmTarget = "21"
+    }
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "liquibase-jpa-test"

src/main/kotlin/com/example/liquibase/LiquibaseApplication.kt

@@ -0,0 +1,11 @@
+package com.example.liquibase
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class LiquibaseApplication
+
+fun main(args: Array<String>) {
+    runApplication<LiquibaseApplication>(*args)
+}

src/main/kotlin/com/example/liquibase/domain/entity/postgres/Author.kt

@@ -0,0 +1,33 @@
+package com.example.liquibase.domain.entity.postgres
+
+import jakarta.persistence.*
+
+@Entity
+@Table(name = "authors")
+class Author {
+    /**
+     * Explaining strategies: https://thoughts-on-java.org/jpa-generate-primary-keys/
+     */
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    var id: Int? = null
+        private set
+
+    @Column(nullable = false, unique = true)
+    var name: String? = null
+        private set
+
+    protected constructor()
+
+    constructor(id: Int?, name: String?) {
+        this.id = id
+        this.name = name
+    }
+
+    override fun toString(): String {
+        return "Author{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                '}'
+    }
+}

src/main/kotlin/com/example/liquibase/domain/entity/postgres/Book.kt

@@ -0,0 +1,37 @@
+package com.example.liquibase.domain.entity.postgres
+
+import jakarta.persistence.*
+
+@Entity
+@Table(name = "books")
+class Book {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    var id: Int = 0
+        private set
+
+    @Column(nullable = false, unique = true)
+    var name: String? = null
+        private set
+
+    @ManyToOne
+    @JoinColumn(name = "author")
+    var author: Author? = null
+        private set
+
+    protected constructor()
+
+    constructor(id: Int, name: String?, author: Author?) {
+        this.id = id
+        this.name = name
+        this.author = author
+    }
+
+    override fun toString(): String {
+        return "Book{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", author=" + author +
+                '}'
+    }
+}

src/main/resources/application.yaml

@@ -0,0 +1,4 @@
+
+spring:
+  jpa.hibernate.ddl-auto: none
+  h2.console.enabled: true

src/test/kotlin/com/example/liquibase/LiquibaseApplicationTests.kt

@@ -0,0 +1,13 @@
+package com.example.liquibase
+
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class LiquibaseApplicationTests {
+
+    @Test
+    fun contextLoads() {
+    }
+
+}