diff --git a/fleet/compiler-plugins/rhizomedb/.gitignore b/fleet/compiler-plugins/rhizomedb/.gitignore
new file mode 100644
index 000000000000..01d8fb504537
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/.gitignore
@@ -0,0 +1,4 @@
+out/
+build/
+.idea/
+.gradle/
\ No newline at end of file
diff --git a/fleet/compiler-plugins/rhizomedb/build.gradle.kts b/fleet/compiler-plugins/rhizomedb/build.gradle.kts
new file mode 100644
index 000000000000..4825dff36c84
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/build.gradle.kts
@@ -0,0 +1,88 @@
+plugins {
+  kotlin("jvm")
+  `maven-publish`
+  `java-gradle-plugin`
+}
+
+val pluginVersion = run {
+  val pluginVersionOverride = System.getProperty("fleet.plugin.version.override")
+  if (pluginVersionOverride != null) {
+    return@run pluginVersionOverride
+  }
+  val versionRegex = Regex("const val VERSION = \"(.+)\"")
+  project.file("src/main/kotlin/com/jetbrains/rhizomedb/plugin/gradle/RhizomeGradlePlugin.kt").readLines().firstNotNullOfOrNull { line ->
+    versionRegex.find(line)?.let { match ->
+      match.groupValues[1]
+    }
+  } ?: error("Cannot find `const val VERSION = \"...\"` in RhizomeGradlePlugin.kt")
+}
+
+// the compiler plugin will be used together with this Kotlin compiler
+val KOTLIN_VERSION = "2.2.0"
+
+// the compiler plugin will be built with these Kotlin LV/APIV
+val KOTLIN_LANGUAGE_VERSION = "2.2"
+val KOTLIN_API_VERSION = "2.2"
+
+group = "jetbrains.fleet"
+version = pluginVersion
+
+repositories {
+  mavenCentral()
+  if ("SNAPSHOT" in KOTLIN_VERSION || "dev" in KOTLIN_VERSION) {
+    mavenLocal()
+  }
+}
+
+dependencies {
+  compileOnly("org.jetbrains.kotlin:kotlin-compiler-embeddable:$KOTLIN_VERSION")
+  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin-api:$KOTLIN_VERSION")
+}
+
+java {
+  withSourcesJar()
+  targetCompatibility = JavaVersion.VERSION_17
+}
+
+kotlin {
+  compilerOptions {
+    jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+    apiVersion.set(org.jetbrains.kotlin.gradle.dsl.KotlinVersion.fromVersion(KOTLIN_LANGUAGE_VERSION))
+    languageVersion.set(org.jetbrains.kotlin.gradle.dsl.KotlinVersion.fromVersion(KOTLIN_API_VERSION))
+    // FREE COMPILER ARGS PLACEHOLDER PLEASE DO NOT CHANGE IT BEFORE DISCUSS IN #ij-monorepo-kotlin
+  }
+}
+
+gradlePlugin {
+  plugins {
+    create("rhizomedbGradle") {
+      id = "rhizomedb"
+      implementationClass = "com.jetbrains.rhizomedb.plugin.gradle.RhizomeGradlePlugin"
+      displayName = "Rhizomedb compiler plugin"
+      description = "Use this plugin for modules, which use rhizomedb"
+    }
+  }
+}
+
+publishing {
+  repositories {
+    maven {
+      url = uri("https://packages.jetbrains.team/maven/p/ij/intellij-dependencies")
+      credentials {
+        username = prop("publishingUsername")
+        password = prop("publishingPassword")
+      }
+    }
+  }
+  publications {
+    create<MavenPublication>("rhizomedbPlugin") {
+      groupId = "jetbrains.fleet"
+      artifactId = "rhizomedb-compiler-plugin"
+      version = pluginVersion
+      from(components["java"])
+    }
+  }
+}
+
+fun prop(name: String): String? =
+  extra.properties[name] as? String
diff --git a/fleet/compiler-plugins/rhizomedb/gradle/wrapper/gradle-wrapper.jar b/fleet/compiler-plugins/rhizomedb/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 000000000000..9bbc975c742b
Binary files /dev/null and b/fleet/compiler-plugins/rhizomedb/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/fleet/compiler-plugins/rhizomedb/gradle/wrapper/gradle-wrapper.properties b/fleet/compiler-plugins/rhizomedb/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 000000000000..37f853b1c84d
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/fleet/compiler-plugins/rhizomedb/gradlew b/fleet/compiler-plugins/rhizomedb/gradlew
new file mode 100755
index 000000000000..faf93008b77e
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/gradlew
@@ -0,0 +1,251 @@
+#!/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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   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/platforms/jvm/plugins-application/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 -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || 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, 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 "$JAVACMD" "$@"
diff --git a/fleet/compiler-plugins/rhizomedb/gradlew.bat b/fleet/compiler-plugins/rhizomedb/gradlew.bat
new file mode 100644
index 000000000000..9d21a21834d5
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/gradlew.bat
@@ -0,0 +1,94 @@
+@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
+@rem SPDX-License-Identifier: Apache-2.0
+@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. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+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
diff --git a/fleet/compiler-plugins/rhizomedb/settings.gradle.kts b/fleet/compiler-plugins/rhizomedb/settings.gradle.kts
new file mode 100644
index 000000000000..19ededc9571b
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/settings.gradle.kts
@@ -0,0 +1,26 @@
+rootProject.name = "rhizomedb-compiler-plugin"
+
+pluginManagement {
+  // the compiler plugin will be built by this Kotlin compiler
+  val KOTLIN_VERSION = "2.2.0"
+
+  plugins {
+    kotlin("jvm") version KOTLIN_VERSION
+  }
+  resolutionStrategy {
+    eachPlugin {
+      repositories {
+        gradlePluginPortal()
+        if ("SNAPSHOT" in KOTLIN_VERSION || "dev" in KOTLIN_VERSION) {
+          mavenLocal()
+        }
+      }
+    }
+  }
+  repositories {
+    gradlePluginPortal()
+    if ("SNAPSHOT" in KOTLIN_VERSION || "dev" in KOTLIN_VERSION) {
+      mavenLocal()
+    }
+  }
+}
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/DeclarationBasedExtension.kt b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/DeclarationBasedExtension.kt
new file mode 100644
index 000000000000..a18b649a8286
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/DeclarationBasedExtension.kt
@@ -0,0 +1,75 @@
+package com.jetbrains.rhizomedb.plugin
+
+import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrDeclaration
+import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
+import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
+import org.jetbrains.kotlin.ir.util.kotlinFqName
+import org.jetbrains.kotlin.ir.visitors.IrVisitorVoid
+import org.jetbrains.kotlin.name.CallableId
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.platform.jvm.JvmPlatform
+
+abstract class DeclarationBasedExtension(
+  protected val pluginContext: IrPluginContext,
+  protected val moduleFragment: IrModuleFragment
+) {
+
+  private val cacheFun = mutableMapOf<CallableId, IrSimpleFunctionSymbol>()
+  private val cacheClass = mutableMapOf<ClassId, IrClassSymbol>()
+
+  protected fun funByName(name: String, prefix: FqName): IrSimpleFunctionSymbol {
+    val callableId = CallableId(prefix, Name.identifier(name))
+    return cacheFun.computeIfAbsent(callableId) {
+      pluginContext.referenceFunctions(it).singleOrNull() ?: throw SymbolNotFoundException(it.toString(), moduleFragment)
+    }
+  }
+
+  protected fun classByName(name: String, prefix: FqName): IrClassSymbol {
+    val classId = ClassId.topLevel(prefix.child(Name.identifier(name)))
+    return cacheClass.computeIfAbsent(classId) {
+      pluginContext.referenceClass(it) ?: throw SymbolNotFoundException(it.asString(), moduleFragment)
+    }
+  }
+
+  /**
+   * Return a list of all IrDeclaration in the module.
+   */
+  protected val declarations by lazy {
+    val declarations = mutableListOf<IrDeclaration>()
+    moduleFragment.accept(object : IrVisitorVoid() {
+      override fun visitElement(element: IrElement) {
+        if (element is IrDeclaration) {
+          declarations += element
+        }
+        element.acceptChildren(this, null)
+      }
+    }, null)
+    declarations
+  }
+
+  /**
+   * This returns true if the current target includes any JVM specific code.
+   */
+  protected fun includesJvmTarget() = pluginContext.platform?.any { it is JvmPlatform } == true
+
+  /**
+   * This returns true if the current target includes any non-JVM specific code.
+   */
+  protected fun includesNonJvmTarget() = pluginContext.platform?.any { it !is JvmPlatform } == true
+
+  protected fun IrClass.jvmLikeName(): String {
+    return when (val thisParent = parent) {
+      is IrClass -> "${thisParent.jvmLikeName()}\$${name}"
+      else -> kotlinFqName.toString()
+    }
+  }
+}
+
+class SymbolNotFoundException(fqn: String, module: IrModuleFragment) :
+  RuntimeException("$fqn cannot be resolved from module `${module.name.asString()}`.")
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/EntityTypeRegistrationGenerator.kt b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/EntityTypeRegistrationGenerator.kt
new file mode 100644
index 000000000000..5f3dd884ead4
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/EntityTypeRegistrationGenerator.kt
@@ -0,0 +1,229 @@
+package com.jetbrains.rhizomedb.plugin
+
+import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
+import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
+import org.jetbrains.kotlin.backend.common.lower.DeclarationIrBuilder
+import org.jetbrains.kotlin.backend.jvm.codegen.AnnotationCodegen.Companion.annotationClass
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.ir.backend.js.utils.nameWithoutExtension
+import org.jetbrains.kotlin.ir.builders.*
+import org.jetbrains.kotlin.ir.builders.declarations.*
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
+import org.jetbrains.kotlin.ir.types.typeWith
+import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.name.CallableId
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+import kotlin.io.path.Path
+import kotlin.io.path.pathString
+
+internal val RHIZOMEDB_FQN = FqName.fromSegments(listOf("com", "jetbrains", "rhizomedb"))
+internal val RHIZOMEDB_FQN_IMPL = RHIZOMEDB_FQN.child(Name.identifier("impl"))
+
+class EntityTypeRegistrationGenerator(
+  val jvmOutputDir: String?,
+  val readProvider: ((String) -> List<String>)? = null,
+  val writeProvider: ((String, Collection<String>) -> Unit)? = null
+) : IrGenerationExtension {
+  override fun generate(moduleFragment: IrModuleFragment, pluginContext: IrPluginContext) {
+    EntityTypeRegistrationGeneratorImpl(
+      jvmOutputDir, 
+      pluginContext, 
+      moduleFragment,
+      readProvider,
+      writeProvider
+    ).generate()
+  }
+}
+
+private class EntityTypeRegistrationGeneratorImpl(
+  val jvmOutputDir: String?,
+  pluginContext: IrPluginContext,
+  moduleFragment: IrModuleFragment,
+  val readProvider: ((String) -> List<String>)? = null,
+  val writeProvider: ((String, Collection<String>) -> Unit)? = null
+) : DeclarationBasedExtension(pluginContext, moduleFragment) {
+
+  val entityType = classByName("EntityType", RHIZOMEDB_FQN).owner
+  val entityTypeProvider = classByName("EntityTypeProvider", RHIZOMEDB_FQN_IMPL).owner
+  val listOfFn =
+    pluginContext.referenceFunctions(CallableId(FqName("kotlin.collections"), Name.identifier("listOf"))).first {
+      it.owner.parameters.singleOrNull()?.varargElementType != null
+    }
+
+
+  /**
+   * Generate [META_INF_FILE] and [META_INF_CACHE_FILE]
+   *
+   * First one contains FQN for the entity type provider classes and can be used to load them on runtime.
+   * Each file with an entity type has such provider.
+   * The second one stores meta-information required for consistency during IC.
+   *
+   * [META_INF_CACHE_FILE] stores tuples `<fqn_provider>;<kind_of_ref>;<ref>`.
+   * <ref> using to detect file deletion to remove FQN from [META_INF_FILE].
+   * It can be a class or a property.
+   */
+  // TODO: support properties like
+  // val MyEntityType = object : EntityType<...>(...) { }
+  fun generate() {
+    val files = moduleFragment.files.toSet()
+
+    // Process declarations and generate files
+    val res = declarations
+      .filterIsInstance<IrClass>()
+      .filter { it.isObject && it.isSubclassOf(entityType) }
+      .groupBy { it.file }
+      .toSortedMap { a, b -> a.fileEntry.name.compareTo(b.fileEntry.name) }
+      .map { (file, decls) ->
+        val providerClass = addEntityProviderClass(file, decls)
+
+        // Non-jvm handling: @EagerInitialization properties that populate a list of providers
+        if (includesNonJvmTarget()) {
+          addEagerInitializedProperty(moduleFragment.name.asStringStripSpecialMarkers(),  file, providerClass)
+        }
+
+        // Return generated class + name for META-INF cache
+        providerClass to decls.first().classIdOrFail.asString()
+      }
+
+    // Jvm handling: META-INF files loaded with reflection
+    if (includesJvmTarget() && jvmOutputDir != null) {
+      val newEntries = res.map { (providerClass, firstEntityClassName) ->
+        val fqn = providerClass.jvmLikeName()
+        "$fqn;C;${firstEntityClassName}"
+      }
+
+      // Step 1: cache file
+      val cacheFilePath = Path("$jvmOutputDir/META-INF/$META_INF_CACHE_FILE").normalize().pathString
+      val cacheProcessor = if (readProvider != null && writeProvider != null) {
+        MetaInfListProcessor(cacheFilePath, readProvider, writeProvider)
+      } else {
+        MetaInfListProcessor(cacheFilePath)
+      }
+
+      val result = cacheProcessor.readAndUpdate(newEntries) { row ->
+        val (_, kind, fqn) = row.split(';')
+        when (kind) {
+          "P" -> false // TODO: support properties
+          "C" -> pluginContext.referenceClass(ClassId.fromString(fqn)).let { refClass ->
+            // 1. Failed to find ref - it is removed, file changed. We will regenerate the provider for file
+            // 2. The ref file is null - file not changed
+            // 3. The ref file is not in IC files set - file not changed
+            refClass != null && refClass.owner.fileOrNull !in files
+          }
+
+          else -> error("Unknown ref kind $kind")
+        }
+      }
+
+      // Step 2: actual list of providers dumped from the previous result
+      val metaInfFilePath = Path("$jvmOutputDir/META-INF/$META_INF_FILE").normalize().pathString
+      val metaInfProcessor = if (readProvider != null && writeProvider != null) {
+        MetaInfListProcessor(metaInfFilePath, readProvider, writeProvider)
+      } else {
+        MetaInfListProcessor(metaInfFilePath)
+      }
+
+      metaInfProcessor.writeOrDelete(result.map { it.substringBefore(';') })
+    }
+  }
+
+  private fun addEntityProviderClass(file: IrFile, decls: List<IrClass>): IrClass {
+    val apiStatusAnnotations = decls.map { it.extractApiStatusAnnotations() }.flatten().distinctBy { it.annotationClass.kotlinFqName.asString() }
+    return file.addClass {
+      name = Name.identifier("${file.nameWithoutExtension}EntityTypeProvider")
+      kind = ClassKind.OBJECT
+    }.apply {
+      // TODO: it is not entirely correct, but for IJ it should work, and shouldn't affect Fleet at all
+      //   if any of the declarations contain ApiStatus annotation, EntityTypeProvider class also will have this annotation
+      annotations = annotations + apiStatusAnnotations
+      superTypes = listOf(entityTypeProvider.defaultType)
+      addSimpleDelegatingConstructor(
+        pluginContext.irBuiltIns.anyClass.owner.primaryConstructor!!,
+        pluginContext.irBuiltIns, true
+      )
+      addProperty {
+        name = Name.identifier("entityTypes")
+      }.apply {
+        val listOfEntityTypes = pluginContext.irBuiltIns.listClass.typeWith(entityType.defaultType)
+        addGetter { returnType = listOfEntityTypes }.apply {
+          parameters = listOf(createDispatchReceiverParameterWithClassParent()) + parameters
+          setBody {
+            +irReturn(
+              irCall(listOfFn).apply {
+                arguments[0] = irVararg(entityType.defaultType, decls.map { irGetObject(it.symbol) })
+              }
+            )
+          }
+        }
+      }
+    }
+  }
+
+  fun IrFunction.setBody(builder: IrBlockBodyBuilder.() -> Unit) {
+    body = DeclarationIrBuilder(pluginContext, symbol).irBlockBody { builder() }
+  }
+
+  /**
+   * Add field marked with @EagerInitialization, which will initialize its value on startup for non-jvm targets,
+   * effectively populating a list of entity types to register.
+   *
+   * Should not be used on JVM-only targets (EagerInitialization annotation is absent there).
+   */
+  private fun addEagerInitializedProperty(moduleName: String, file: IrFile, targetClass: IrClass) {
+    val registerProviderFunction = funByName("registerEntityTypeProvider", RHIZOMEDB_FQN_IMPL)
+    val eagerAnnotation = classByName("EagerInitialization", FqName("kotlin"))
+
+    with(pluginContext.irFactory) {
+      // private val MyEntityTypeRegisterToken
+      buildProperty {
+        name = Name.identifier("${file.nameWithoutExtension}EntityTypeRegisterToken")
+        isVar = false
+        visibility = DescriptorVisibilities.PRIVATE
+      }.apply {
+        // @EagerInitialization
+        annotations += with(DeclarationIrBuilder(pluginContext, symbol)) {
+          irCall(eagerAnnotation.owner.primaryConstructor!!.symbol)
+        }
+
+        // Needs to be called before addBackingField
+        file.addChild(this)
+
+        // = markForRegistration(MyEntityTypeProvider)
+        addBackingField {
+          name = Name.identifier("_${file.nameWithoutExtension}EntityTypeRegisterToken")
+          type = pluginContext.irBuiltIns.booleanType
+          isFinal = true
+          isStatic = true
+          visibility = DescriptorVisibilities.PRIVATE
+          origin = IrDeclarationOrigin.PROPERTY_BACKING_FIELD
+        }.let {
+          it.initializer = createExpressionBody(with(DeclarationIrBuilder(pluginContext, symbol)) {
+            irCall(registerProviderFunction).apply {
+              arguments[0] = irString(moduleName)
+              arguments[1] = irGetObject(targetClass.symbol)
+            }
+          })
+        }
+      }
+    }
+  }
+
+  private fun IrDeclarationParent.addClass(builder: IrClassBuilder.() -> Unit) =
+    pluginContext.irFactory.buildClass(builder).apply {
+      parent = this@addClass
+      (this@addClass as IrDeclarationContainer).declarations += this
+      createThisReceiverParameter()
+    }
+
+}
+
+internal fun IrAnnotationContainer.extractApiStatusAnnotations(): List<IrConstructorCall> {
+  return annotations.filter { it.annotationClass.kotlinFqName.startsWith(FqName.fromSegments(listOf("org", "jetbrains", "annotations", "ApiStatus"))) }
+}
+
+private const val META_INF_FILE = "com.jetbrains.rhizomedb.impl.EntityTypeProvider.txt"
+private const val META_INF_CACHE_FILE = "com.jetbrains.rhizomedb.impl.EntityTypeProvider.cache"
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/MetaInfListProcessor.kt b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/MetaInfListProcessor.kt
new file mode 100644
index 000000000000..b99ed6c4f20b
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/MetaInfListProcessor.kt
@@ -0,0 +1,72 @@
+package com.jetbrains.rhizomedb.plugin
+
+import java.io.File
+import java.io.IOException
+
+class MetaInfListProcessor(
+  private val pathName: String,
+  private val readProvider: ((String) -> List<String>)? = null,
+  private val writeProvider: ((String, Collection<String>) -> Unit)? = null
+) {
+  private val file = File(pathName)
+
+  fun read(filterOutdated: (String) -> Boolean = { true }): List<String> {
+    val lines = try {
+      if (readProvider != null) {
+        readProvider.invoke(pathName)
+      } else {
+        if (file.exists()) file.readLines() else emptyList()
+      }
+    }
+    catch (e: IOException) {
+      throw IOException("Cannot read file $file to update registrars list", e)
+    }
+
+    return lines.filter { row -> filterOutdated(row) }
+  }
+
+  /**
+   * Process previous cache and merge with newly generated content.
+   *
+   * @param newContent new content to merge, will not be filtered by [checkPreviousContent]
+   * @param checkPreviousContent filter to apply on content that is already in cache file, if it returns true, the row will be kept in the new version
+   * @return merged content, without duplicates that was written to file
+   */
+  fun readAndUpdate(newContent: List<String>, checkPreviousContent: (String) -> Boolean = { true }): Set<String> {
+    return (newContent + read(checkPreviousContent)).toSet()
+      .also {
+        writeOrDelete(it)
+      }
+  }
+
+  fun writeOrDelete(dump: Collection<String>) {
+    if (writeProvider != null) {
+      writeProvider.invoke(pathName, dump)
+      return
+    }
+
+    if (dump.isNotEmpty()) {
+      try {
+        file.parentFile.mkdirs()
+        file.createNewFile()
+        file.printWriter().use { out ->
+          dump.forEach { entry ->
+            out.print(entry)
+            out.print("\n")
+          }
+        }
+      }
+      catch (e: IOException) {
+        throw IOException("Cannot write into $file file", e)
+      }
+    }
+    else {
+      try {
+        file.delete()
+      }
+      catch (e: IOException) {
+        throw IOException("Cannot delete $file file with", e)
+      }
+    }
+  }
+}
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/RhizomedbCommandLineProcessor.kt b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/RhizomedbCommandLineProcessor.kt
new file mode 100644
index 000000000000..8edd4765730d
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/RhizomedbCommandLineProcessor.kt
@@ -0,0 +1,18 @@
+package com.jetbrains.rhizomedb.plugin
+
+import org.jetbrains.kotlin.compiler.plugin.AbstractCliOption
+import org.jetbrains.kotlin.compiler.plugin.CommandLineProcessor
+import org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.config.JVMConfigurationKeys
+
+@OptIn(ExperimentalCompilerApi::class)
+class RhizomedbCommandLineProcessor : CommandLineProcessor {
+  override val pluginId: String = "rhizomedb"
+  override val pluginOptions: Collection<AbstractCliOption> = emptyList()
+}
+
+// todo - support list of modules??
+fun getJvmOutputDir(configuration: CompilerConfiguration) =
+  configuration[JVMConfigurationKeys.MODULES]?.singleOrNull()?.getOutputDirectory()
+  ?: configuration.get(JVMConfigurationKeys.OUTPUT_DIRECTORY)?.absolutePath
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/RhizomedbComponentRegistrar.kt b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/RhizomedbComponentRegistrar.kt
new file mode 100644
index 000000000000..25f76460673d
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/RhizomedbComponentRegistrar.kt
@@ -0,0 +1,24 @@
+package com.jetbrains.rhizomedb.plugin
+
+import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
+import org.jetbrains.kotlin.compiler.plugin.CompilerPluginRegistrar
+import org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi
+import org.jetbrains.kotlin.config.CompilerConfiguration
+
+@OptIn(ExperimentalCompilerApi::class)
+class RhizomedbComponentRegistrar(
+  private val readProvider: ((String) -> List<String>)? = null,
+  private val writeProvider: ((String, Collection<String>) -> Unit)? = null
+) : CompilerPluginRegistrar() {
+  override val supportsK2: Boolean = true
+  override fun ExtensionStorage.registerExtensions(configuration: CompilerConfiguration) {
+    val output = getJvmOutputDir(configuration)
+    IrGenerationExtension.registerExtension(
+      EntityTypeRegistrationGenerator(
+        jvmOutputDir = output,
+        readProvider = readProvider,
+        writeProvider = writeProvider
+      )
+    )
+  }
+}
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/gradle/RhizomeGradlePlugin.kt b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/gradle/RhizomeGradlePlugin.kt
new file mode 100644
index 000000000000..421f82b6a8e2
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/kotlin/com/jetbrains/rhizomedb/plugin/gradle/RhizomeGradlePlugin.kt
@@ -0,0 +1,27 @@
+package com.jetbrains.rhizomedb.plugin.gradle
+
+import org.gradle.api.provider.Provider
+import org.jetbrains.kotlin.gradle.plugin.KotlinCompilation
+import org.jetbrains.kotlin.gradle.plugin.KotlinCompilerPluginSupportPlugin
+import org.jetbrains.kotlin.gradle.plugin.SubpluginArtifact
+import org.jetbrains.kotlin.gradle.plugin.SubpluginOption
+
+private const val VERSION = "2.2.0-0.2"
+
+class RhizomeGradlePlugin : KotlinCompilerPluginSupportPlugin {
+  override fun isApplicable(kotlinCompilation: KotlinCompilation<*>): Boolean = true
+
+  override fun getCompilerPluginId(): String = "rhizomedb"
+
+  override fun getPluginArtifact(): SubpluginArtifact = SubpluginArtifact(
+    groupId = "jetbrains.fleet",
+    artifactId = "rhizomedb-compiler-plugin", //it's name of gradle module
+    version = VERSION
+  )
+
+  override fun applyToCompilation(
+    kotlinCompilation: KotlinCompilation<*>
+  ): Provider<List<SubpluginOption>> {
+    return kotlinCompilation.target.project.provider { emptyList() }
+  }
+}
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/resources/META-INF/services/org.jetbrains.kotlin.compiler.plugin.CommandLineProcessor b/fleet/compiler-plugins/rhizomedb/src/main/resources/META-INF/services/org.jetbrains.kotlin.compiler.plugin.CommandLineProcessor
new file mode 100644
index 000000000000..c76d59e0791a
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/resources/META-INF/services/org.jetbrains.kotlin.compiler.plugin.CommandLineProcessor
@@ -0,0 +1 @@
+com.jetbrains.rhizomedb.plugin.RhizomedbCommandLineProcessor
\ No newline at end of file
diff --git a/fleet/compiler-plugins/rhizomedb/src/main/resources/META-INF/services/org.jetbrains.kotlin.compiler.plugin.CompilerPluginRegistrar b/fleet/compiler-plugins/rhizomedb/src/main/resources/META-INF/services/org.jetbrains.kotlin.compiler.plugin.CompilerPluginRegistrar
new file mode 100644
index 000000000000..3ed203961875
--- /dev/null
+++ b/fleet/compiler-plugins/rhizomedb/src/main/resources/META-INF/services/org.jetbrains.kotlin.compiler.plugin.CompilerPluginRegistrar
@@ -0,0 +1 @@
+com.jetbrains.rhizomedb.plugin.RhizomedbComponentRegistrar
\ No newline at end of file