Index: .gitignore
===================================================================
--- .gitignore	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ .gitignore	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,38 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+compose.yaml
+.env
+.mvn/* 
+.mvn 
Index: L.sql
===================================================================
--- DDL.sql	(revision 857e6db5c8723ff9b83da971357e912a80d635a9)
+++ 	(revision )
@@ -1,151 +1,0 @@
-create table users(
-	username varchar(32) primary key, 
-	is_activate bool, 
-	password varchar(72), 
-	description varchar(200), 
-	registered_at timestamp,
-	sex varchar(1)
-); 
-
-create table moderator() inherits (users);
-create table developer() inherits (users); 
-create table project_manager() inherits (users); 
-
-create table thread (
-	id serial primary key,
-	description text,
-	logo_url text,
-	title varchar(32),
-	username varchar(32) references users(username)
-);
-
-create table likes(
-	username varchar(32) references users(username), 
-	thread_id int references thread(id),
-	primary key(username, thread_id)
-); 
-
-create table threads_moderators(
-	thread_id int references thread(id) on delete cascade,
-	username varchar(32) references users(username) on delete cascade,
-	primary key(thread_id, username)
-);
-
-create table tag(
-	name varchar(64) primary key
-);
-
-create table tag_threads(
-	thread_id int references thread(id),
-	tag_name varchar(64) references tag(name),
-	primary key(thread_id, tag_name)
-);
-
-create table topic_thread (
-	guidelines jsonb,
-	next_discussion_id int
-) inherits (thread);
-
-create table topic_belongs_to_project(
-	topic_id int references thread(id) on delete cascade,
-	project_id int references thread(id) on delete cascade,
-	primary key(topic_id,project_id)
-);
-
-create table topic_blacklist(
-	username varchar(32) references users(username) on delete cascade,
-	project_id varchar(32) references users(username) on delete cascade,
-	primary key(username,project_id)
-);
-
-create table project_thread (
-	repo_url text
-) inherits (thread);
-
-create table discussion_thread(
-	text text,
-	id int,
-	topic_id int not null references thread(id),
-	created_by_user varchar(32) not null references users(username),
-	reply_discussion int,
-	reply_topic_id int,
-	primary key(topic_id, id),
-	check ((reply_discussion is null) and (topic_id = reply_topic_id))
-);
-
-create table developer_associated_with_project(
-	project_id int references thread(id),
-	developer varchar(32) references users(username),
-	started_at timestamp,
-	ended_at timestamp,
-	primary key(project_id, developer, started_at)
-);
-
-create table permissions(
-	name varchar(32) primary key
-); 
-
-create table project_roles(
-	name varchar(32),
-	project_id int references thread(id) on delete cascade,
-	description text not null,
-	primary key(name, project_id)
-);
-
-create table users_project_roles(
-	username varchar(32) references users(username),
-	project_id int, 
-	role_name varchar(32),
-	FOREIGN KEY (role_name, project_id)
-    REFERENCES project_roles(name, project_id),
-    primary key(username, project_id, role_name)
-);
-
-create table project_roles_permissions(
-	permission_name varchar(32) references permissions(name),
-	role_name varchar(32),
-	project_id int,
-	primary key(permission_name, role_name, project_id),
-	FOREIGN KEY (role_name, project_id)
-    REFERENCES project_roles(name, project_id)
-);
-
-CREATE TYPE status AS ENUM ('ACCEPTED', 'DENIED', 'PENDING');
-
-create table project_request(
-	id serial primary key,
-	reason varchar (200),
-	status status,
-	submited_by_user varchar(32) references users(username) not null,
-	for_project int references thread(id) not null	
-); 
-
-create table report(
-	id serial primary key,
-	created_at timestamp,
-	description varchar(200),
-	status status,
-	thread_id int references thread(id) not null,
-	for_user varchar(32) references users(username) not null,
-	by_user varchar(32) references users(username) not null
-);
-
-create table channel (
-	name varchar (64),
-	description varchar(200),
-	logo_url text,
-	project_id int references thread(id) on delete cascade,
-	developer varchar(32) references users(username),
-	primary key(name, project_id)
-);
-
-create table messages (
-	sent_at timestamp,
-	content varchar(200),
-	sent_by varchar(32) references users(username) not null,
-	project_id int,
-	channel_name varchar(64),
-	FOREIGN KEY (channel_name, project_id)
-    REFERENCES channel(name, project_id) on delete cascade,
-    primary key(channel_name, project_id, sent_at, sent_by)
-);
Index: mvnw
===================================================================
--- mvnw	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ mvnw	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,259 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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
+#
+#    http://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.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.3.2
+#
+# Optional ENV vars
+# -----------------
+#   JAVA_HOME - location of a JDK home dir, required when download maven via java source
+#   MVNW_REPOURL - repo url base for downloading maven distribution
+#   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+#   MVNW_VERBOSE - true: enable verbose log; debug: trace the mvnw script; others: silence the output
+# ----------------------------------------------------------------------------
+
+set -euf
+[ "${MVNW_VERBOSE-}" != debug ] || set -x
+
+# OS specific support.
+native_path() { printf %s\\n "$1"; }
+case "$(uname)" in
+CYGWIN* | MINGW*)
+  [ -z "${JAVA_HOME-}" ] || JAVA_HOME="$(cygpath --unix "$JAVA_HOME")"
+  native_path() { cygpath --path --windows "$1"; }
+  ;;
+esac
+
+# set JAVACMD and JAVACCMD
+set_java_home() {
+  # For Cygwin and MinGW, ensure paths are in Unix format before anything is touched
+  if [ -n "${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"
+      JAVACCMD="$JAVA_HOME/jre/sh/javac"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+      JAVACCMD="$JAVA_HOME/bin/javac"
+
+      if [ ! -x "$JAVACMD" ] || [ ! -x "$JAVACCMD" ]; then
+        echo "The JAVA_HOME environment variable is not defined correctly, so mvnw cannot run." >&2
+        echo "JAVA_HOME is set to \"$JAVA_HOME\", but \"\$JAVA_HOME/bin/java\" or \"\$JAVA_HOME/bin/javac\" does not exist." >&2
+        return 1
+      fi
+    fi
+  else
+    JAVACMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v java
+    )" || :
+    JAVACCMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v javac
+    )" || :
+
+    if [ ! -x "${JAVACMD-}" ] || [ ! -x "${JAVACCMD-}" ]; then
+      echo "The java/javac command does not exist in PATH nor is JAVA_HOME set, so mvnw cannot run." >&2
+      return 1
+    fi
+  fi
+}
+
+# hash string like Java String::hashCode
+hash_string() {
+  str="${1:-}" h=0
+  while [ -n "$str" ]; do
+    char="${str%"${str#?}"}"
+    h=$(((h * 31 + $(LC_CTYPE=C printf %d "'$char")) % 4294967296))
+    str="${str#?}"
+  done
+  printf %x\\n $h
+}
+
+verbose() { :; }
+[ "${MVNW_VERBOSE-}" != true ] || verbose() { printf %s\\n "${1-}"; }
+
+die() {
+  printf %s\\n "$1" >&2
+  exit 1
+}
+
+trim() {
+  # MWRAPPER-139:
+  #   Trims trailing and leading whitespace, carriage returns, tabs, and linefeeds.
+  #   Needed for removing poorly interpreted newline sequences when running in more
+  #   exotic environments such as mingw bash on Windows.
+  printf "%s" "${1}" | tr -d '[:space:]'
+}
+
+# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
+while IFS="=" read -r key value; do
+  case "${key-}" in
+  distributionUrl) distributionUrl=$(trim "${value-}") ;;
+  distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;
+  esac
+done <"${0%/*}/.mvn/wrapper/maven-wrapper.properties"
+[ -n "${distributionUrl-}" ] || die "cannot read distributionUrl property in ${0%/*}/.mvn/wrapper/maven-wrapper.properties"
+
+case "${distributionUrl##*/}" in
+maven-mvnd-*bin.*)
+  MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/
+  case "${PROCESSOR_ARCHITECTURE-}${PROCESSOR_ARCHITEW6432-}:$(uname -a)" in
+  *AMD64:CYGWIN* | *AMD64:MINGW*) distributionPlatform=windows-amd64 ;;
+  :Darwin*x86_64) distributionPlatform=darwin-amd64 ;;
+  :Darwin*arm64) distributionPlatform=darwin-aarch64 ;;
+  :Linux*x86_64*) distributionPlatform=linux-amd64 ;;
+  *)
+    echo "Cannot detect native platform for mvnd on $(uname)-$(uname -m), use pure java version" >&2
+    distributionPlatform=linux-amd64
+    ;;
+  esac
+  distributionUrl="${distributionUrl%-bin.*}-$distributionPlatform.zip"
+  ;;
+maven-mvnd-*) MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/ ;;
+*) MVN_CMD="mvn${0##*/mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+[ -z "${MVNW_REPOURL-}" ] || distributionUrl="$MVNW_REPOURL$_MVNW_REPO_PATTERN${distributionUrl#*"$_MVNW_REPO_PATTERN"}"
+distributionUrlName="${distributionUrl##*/}"
+distributionUrlNameMain="${distributionUrlName%.*}"
+distributionUrlNameMain="${distributionUrlNameMain%-bin}"
+MAVEN_USER_HOME="${MAVEN_USER_HOME:-${HOME}/.m2}"
+MAVEN_HOME="${MAVEN_USER_HOME}/wrapper/dists/${distributionUrlNameMain-}/$(hash_string "$distributionUrl")"
+
+exec_maven() {
+  unset MVNW_VERBOSE MVNW_USERNAME MVNW_PASSWORD MVNW_REPOURL || :
+  exec "$MAVEN_HOME/bin/$MVN_CMD" "$@" || die "cannot exec $MAVEN_HOME/bin/$MVN_CMD"
+}
+
+if [ -d "$MAVEN_HOME" ]; then
+  verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  exec_maven "$@"
+fi
+
+case "${distributionUrl-}" in
+*?-bin.zip | *?maven-mvnd-?*-?*.zip) ;;
+*) die "distributionUrl is not valid, must match *-bin.zip or maven-mvnd-*.zip, but found '${distributionUrl-}'" ;;
+esac
+
+# prepare tmp dir
+if TMP_DOWNLOAD_DIR="$(mktemp -d)" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
+  clean() { rm -rf -- "$TMP_DOWNLOAD_DIR"; }
+  trap clean HUP INT TERM EXIT
+else
+  die "cannot create temp dir"
+fi
+
+mkdir -p -- "${MAVEN_HOME%/*}"
+
+# Download and Install Apache Maven
+verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+verbose "Downloading from: $distributionUrl"
+verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+# select .zip or .tar.gz
+if ! command -v unzip >/dev/null; then
+  distributionUrl="${distributionUrl%.zip}.tar.gz"
+  distributionUrlName="${distributionUrl##*/}"
+fi
+
+# verbose opt
+__MVNW_QUIET_WGET=--quiet __MVNW_QUIET_CURL=--silent __MVNW_QUIET_UNZIP=-q __MVNW_QUIET_TAR=''
+[ "${MVNW_VERBOSE-}" != true ] || __MVNW_QUIET_WGET='' __MVNW_QUIET_CURL='' __MVNW_QUIET_UNZIP='' __MVNW_QUIET_TAR=v
+
+# normalize http auth
+case "${MVNW_PASSWORD:+has-password}" in
+'') MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+has-password) [ -n "${MVNW_USERNAME-}" ] || MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+esac
+
+if [ -z "${MVNW_USERNAME-}" ] && command -v wget >/dev/null; then
+  verbose "Found wget ... using wget"
+  wget ${__MVNW_QUIET_WGET:+"$__MVNW_QUIET_WGET"} "$distributionUrl" -O "$TMP_DOWNLOAD_DIR/$distributionUrlName" || die "wget: Failed to fetch $distributionUrl"
+elif [ -z "${MVNW_USERNAME-}" ] && command -v curl >/dev/null; then
+  verbose "Found curl ... using curl"
+  curl ${__MVNW_QUIET_CURL:+"$__MVNW_QUIET_CURL"} -f -L -o "$TMP_DOWNLOAD_DIR/$distributionUrlName" "$distributionUrl" || die "curl: Failed to fetch $distributionUrl"
+elif set_java_home; then
+  verbose "Falling back to use Java to download"
+  javaSource="$TMP_DOWNLOAD_DIR/Downloader.java"
+  targetZip="$TMP_DOWNLOAD_DIR/$distributionUrlName"
+  cat >"$javaSource" <<-END
+	public class Downloader extends java.net.Authenticator
+	{
+	  protected java.net.PasswordAuthentication getPasswordAuthentication()
+	  {
+	    return new java.net.PasswordAuthentication( System.getenv( "MVNW_USERNAME" ), System.getenv( "MVNW_PASSWORD" ).toCharArray() );
+	  }
+	  public static void main( String[] args ) throws Exception
+	  {
+	    setDefault( new Downloader() );
+	    java.nio.file.Files.copy( java.net.URI.create( args[0] ).toURL().openStream(), java.nio.file.Paths.get( args[1] ).toAbsolutePath().normalize() );
+	  }
+	}
+	END
+  # For Cygwin/MinGW, switch paths to Windows format before running javac and java
+  verbose " - Compiling Downloader.java ..."
+  "$(native_path "$JAVACCMD")" "$(native_path "$javaSource")" || die "Failed to compile Downloader.java"
+  verbose " - Running Downloader.java ..."
+  "$(native_path "$JAVACMD")" -cp "$(native_path "$TMP_DOWNLOAD_DIR")" Downloader "$distributionUrl" "$(native_path "$targetZip")"
+fi
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+if [ -n "${distributionSha256Sum-}" ]; then
+  distributionSha256Result=false
+  if [ "$MVN_CMD" = mvnd.sh ]; then
+    echo "Checksum validation is not supported for maven-mvnd." >&2
+    echo "Please disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  elif command -v sha256sum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | sha256sum -c >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  elif command -v shasum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  else
+    echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available." >&2
+    echo "Please install either command, or disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  fi
+  if [ $distributionSha256Result = false ]; then
+    echo "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised." >&2
+    echo "If you updated your Maven version, you need to update the specified distributionSha256Sum property." >&2
+    exit 1
+  fi
+fi
+
+# unzip and move
+if command -v unzip >/dev/null; then
+  unzip ${__MVNW_QUIET_UNZIP:+"$__MVNW_QUIET_UNZIP"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -d "$TMP_DOWNLOAD_DIR" || die "failed to unzip"
+else
+  tar xzf${__MVNW_QUIET_TAR:+"$__MVNW_QUIET_TAR"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -C "$TMP_DOWNLOAD_DIR" || die "failed to untar"
+fi
+printf %s\\n "$distributionUrl" >"$TMP_DOWNLOAD_DIR/$distributionUrlNameMain/mvnw.url"
+mv -- "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" "$MAVEN_HOME" || [ -d "$MAVEN_HOME" ] || die "fail to move MAVEN_HOME"
+
+clean || :
+exec_maven "$@"
Index: pom.xml
===================================================================
--- pom.xml	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ pom.xml	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,89 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.4.1</version>
+        <relativePath/>
+    </parent>
+    <groupId>com.db.finki.www</groupId>
+    <artifactId>build_board</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-thymeleaf</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <scope>runtime</scope>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-database-postgresql</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>42.7.4</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
Index: src/main/java/com/db/finki/www/build_board/DemoApplication.java
===================================================================
--- src/main/java/com/db/finki/www/build_board/DemoApplication.java	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ src/main/java/com/db/finki/www/build_board/DemoApplication.java	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,13 @@
+package com.db.finki.www.build_board;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}
Index: src/main/resources/application.properties
===================================================================
--- src/main/resources/application.properties	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ src/main/resources/application.properties	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,8 @@
+spring.application.name=build_board
+
+spring.datasource.username=${POSTGRES_USER}
+spring.datasource.password=${POSTGRES_PASSWORD}
+spring.datasource.url=jdbc:postgresql://localhost:5432/${POSTGRES_DB}
+
+spring.flyway.password=${POSTGRES_PASSWORD}
+spring.flyway.user=${POSTGRES_USER}
Index: src/main/resources/db/migration/V1__init_ddl.sql
===================================================================
--- src/main/resources/db/migration/V1__init_ddl.sql	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ src/main/resources/db/migration/V1__init_ddl.sql	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,151 @@
+create table users(
+	username varchar(32) primary key, 
+	is_activate bool, 
+	password varchar(72), 
+	description varchar(200), 
+	registered_at timestamp,
+	sex varchar(1)
+); 
+
+create table moderator() inherits (users);
+create table developer() inherits (users); 
+create table project_manager() inherits (users); 
+
+create table thread (
+	id serial primary key,
+	description text,
+	logo_url text,
+	title varchar(32),
+	username varchar(32) references users(username)
+);
+
+create table likes(
+	username varchar(32) references users(username), 
+	thread_id int references thread(id),
+	primary key(username, thread_id)
+); 
+
+create table threads_moderators(
+	thread_id int references thread(id) on delete cascade,
+	username varchar(32) references users(username) on delete cascade,
+	primary key(thread_id, username)
+);
+
+create table tag(
+	name varchar(64) primary key
+);
+
+create table tag_threads(
+	thread_id int references thread(id),
+	tag_name varchar(64) references tag(name),
+	primary key(thread_id, tag_name)
+);
+
+create table topic_thread (
+	guidelines jsonb,
+	next_discussion_id int
+) inherits (thread);
+
+create table topic_belongs_to_project(
+	topic_id int references thread(id) on delete cascade,
+	project_id int references thread(id) on delete cascade,
+	primary key(topic_id,project_id)
+);
+
+create table topic_blacklist(
+	username varchar(32) references users(username) on delete cascade,
+	project_id varchar(32) references users(username) on delete cascade,
+	primary key(username,project_id)
+);
+
+create table project_thread (
+	repo_url text
+) inherits (thread);
+
+create table discussion_thread(
+	text text,
+	id int,
+	topic_id int not null references thread(id),
+	created_by_user varchar(32) not null references users(username),
+	reply_discussion int,
+	reply_topic_id int,
+	primary key(topic_id, id),
+	check ((reply_discussion is null) and (topic_id = reply_topic_id))
+);
+
+create table developer_associated_with_project(
+	project_id int references thread(id),
+	developer varchar(32) references users(username),
+	started_at timestamp,
+	ended_at timestamp,
+	primary key(project_id, developer, started_at)
+);
+
+create table permissions(
+	name varchar(32) primary key
+); 
+
+create table project_roles(
+	name varchar(32),
+	project_id int references thread(id) on delete cascade,
+	description text not null,
+	primary key(name, project_id)
+);
+
+create table users_project_roles(
+	username varchar(32) references users(username),
+	project_id int, 
+	role_name varchar(32),
+	FOREIGN KEY (role_name, project_id)
+    REFERENCES project_roles(name, project_id),
+    primary key(username, project_id, role_name)
+);
+
+create table project_roles_permissions(
+	permission_name varchar(32) references permissions(name),
+	role_name varchar(32),
+	project_id int,
+	primary key(permission_name, role_name, project_id),
+	FOREIGN KEY (role_name, project_id)
+    REFERENCES project_roles(name, project_id)
+);
+
+CREATE TYPE status AS ENUM ('ACCEPTED', 'DENIED', 'PENDING');
+
+create table project_request(
+	id serial primary key,
+	reason varchar (200),
+	status status,
+	submited_by_user varchar(32) references users(username) not null,
+	for_project int references thread(id) not null	
+); 
+
+create table report(
+	id serial primary key,
+	created_at timestamp,
+	description varchar(200),
+	status status,
+	thread_id int references thread(id) not null,
+	for_user varchar(32) references users(username) not null,
+	by_user varchar(32) references users(username) not null
+);
+
+create table channel (
+	name varchar (64),
+	description varchar(200),
+	logo_url text,
+	project_id int references thread(id) on delete cascade,
+	developer varchar(32) references users(username),
+	primary key(name, project_id)
+);
+
+create table messages (
+	sent_at timestamp,
+	content varchar(200),
+	sent_by varchar(32) references users(username) not null,
+	project_id int,
+	channel_name varchar(64),
+	FOREIGN KEY (channel_name, project_id)
+    REFERENCES channel(name, project_id) on delete cascade,
+    primary key(channel_name, project_id, sent_at, sent_by)
+);
Index: src/test/java/com/db/finki/www/build_board/DemoApplicationTests.java
===================================================================
--- src/test/java/com/db/finki/www/build_board/DemoApplicationTests.java	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
+++ src/test/java/com/db/finki/www/build_board/DemoApplicationTests.java	(revision a64c452ac48eb956c17b70b48cf1925e8f8547f4)
@@ -0,0 +1,13 @@
+package com.db.finki.www.build_board;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class DemoApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}
