diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..e28a7c2
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,43 @@
+val ktor_version: String by project
+val kotlin_version: String by project
+val logback_version: String by project
+
+val exposed_version: String by project
+val h2_version: String by project
+plugins {
+    kotlin("jvm") version "1.9.20"
+    id("io.ktor.plugin") version "2.3.6"
+    id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
+}
+
+group = "amine.bou"
+version = "0.0.1"
+
+application {
+    mainClass.set("amine.bou.ApplicationKt")
+
+    val isDevelopment: Boolean = project.ext.has("development")
+    applicationDefaultJvmArgs = listOf("-Dio.ktor.development=$isDevelopment")
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("io.ktor:ktor-server-core-jvm")
+    implementation("io.ktor:ktor-server-content-negotiation-jvm")
+    implementation("io.ktor:ktor-serialization-kotlinx-json-jvm")
+    implementation("org.jetbrains.exposed:exposed-core:$exposed_version")
+    implementation("org.jetbrains.exposed:exposed-jdbc:$exposed_version")
+    implementation("org.jetbrains.exposed:exposed-java-time:$exposed_version")
+    implementation("org.jetbrains.exposed:exposed-dao:$exposed_version")
+    implementation("org.xerial:sqlite-jdbc:3.30.1")
+    implementation("io.ktor:ktor-server-compression-jvm")
+    implementation("io.ktor:ktor-server-resources")
+    implementation("io.ktor:ktor-server-auth-jvm")
+    implementation("io.ktor:ktor-server-netty-jvm")
+    implementation("ch.qos.logback:logback-classic:$logback_version")
+    testImplementation("io.ktor:ktor-server-tests-jvm")
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..71a08f2
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,6 @@
+ktor_version=2.3.6
+kotlin_version=1.9.20
+logback_version=1.4.11
+kotlin.code.style=official
+exposed_version=0.41.1
+h2_version=2.1.214
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..7454180
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e411586
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..1b6c787
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,234 @@
+#!/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/master/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
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$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
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# 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/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..107acd3
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@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=.
+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%" == "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%"=="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!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..ca6a6dd
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1 @@
+rootProject.name = "habits-api"
diff --git a/src/main/kotlin/amine/bou/Application.kt b/src/main/kotlin/amine/bou/Application.kt
new file mode 100644
index 0000000..7736489
--- /dev/null
+++ b/src/main/kotlin/amine/bou/Application.kt
@@ -0,0 +1,19 @@
+package amine.bou
+
+import amine.bou.plugins.*
+import io.ktor.server.application.*
+import io.ktor.server.engine.*
+import io.ktor.server.netty.*
+
+fun main() {
+    embeddedServer(Netty, port = 8083, host = "0.0.0.0", module = Application::module)
+        .start(wait = true)
+}
+
+fun Application.module() {
+    configureSerialization()
+    configureDatabases()
+    configureHTTP()
+    configureSecurity()
+    configureRouting()
+}
diff --git a/src/main/kotlin/amine/bou/DB/DB.kt b/src/main/kotlin/amine/bou/DB/DB.kt
new file mode 100644
index 0000000..ff6df84
--- /dev/null
+++ b/src/main/kotlin/amine/bou/DB/DB.kt
@@ -0,0 +1,85 @@
+package amine.bou.DB
+
+import amine.bou.models.HabitOccurrenceView
+import amine.bou.models.HabitView
+import amine.bou.models.toView
+import io.ktor.server.plugins.*
+import org.jetbrains.exposed.sql.and
+import org.jetbrains.exposed.sql.transactions.transaction
+import java.time.LocalDate
+
+class DB {
+    fun createHabit(request: HabitView): HabitView {
+        return transaction {
+            val h = Habit.new {
+                name = request.name
+                color = request.color
+                recurrence = request.recurrence
+            }
+            h.toView()
+        }
+    }
+
+    fun getAllHabits(): List<HabitView> {
+        return transaction {
+            return@transaction Habit.all().map {it.toView()}.toList()
+        }
+    }
+
+    fun getOneHabit(id: Int): HabitView {
+        return transaction {
+            val habit = Habit.findById(id) ?: throw NotFoundException()
+            return@transaction habit.toView()
+        }
+    }
+
+    fun deleteHabit(id: Int) {
+        return transaction {
+            return@transaction Habit.findById(id)?.delete() ?: throw NotFoundException()
+        }
+    }
+
+    fun updateHabit(id: Int, request: HabitView): HabitView {
+        return transaction {
+            val habit = Habit.findById(id) ?: throw NotFoundException()
+
+            if (habit.color != request.color) {
+                habit.color = request.color
+            }
+
+            if (habit.name != request.name) {
+                habit.name = request.name
+            }
+
+            if (habit.recurrence != request.recurrence) {
+                habit.recurrence = request.recurrence
+            }
+
+            // TODO: Handle occurrences on recurrence change ?
+
+            return@transaction habit.toView()
+        }
+    }
+
+    fun createOccurrence(habitId: Int, request: HabitOccurrenceView): HabitOccurrenceView {
+        return transaction {
+            val h = Habit.findById(habitId) ?: throw NotFoundException()
+            
+            val o = HabitOccurrence.new {
+                occurence = LocalDate.parse(request.date)
+                habit = h
+            }
+
+            // TODO: maybe handle streaks
+            return@transaction o.toView()
+        }
+    }
+
+    fun deleteOccurrence(habitId: Int, id: Long): Any {
+        return transaction {
+            val h = Habit.findById(habitId) ?: throw NotFoundException()
+
+            return@transaction HabitOccurrence.find { HabitOccurrences.id eq id and (HabitOccurrences.habit eq habitId) }.firstOrNull()?.delete() ?: throw NotFoundException()
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/DB/Habit.kt b/src/main/kotlin/amine/bou/DB/Habit.kt
new file mode 100644
index 0000000..e774579
--- /dev/null
+++ b/src/main/kotlin/amine/bou/DB/Habit.kt
@@ -0,0 +1,23 @@
+package amine.bou.DB
+
+import amine.bou.models.RecurrenceViewEnum
+import org.jetbrains.exposed.dao.IntEntity
+import org.jetbrains.exposed.dao.IntEntityClass
+import org.jetbrains.exposed.dao.id.EntityID
+import org.jetbrains.exposed.dao.id.IntIdTable
+
+object Habits : IntIdTable() {
+    val name = varchar("name", 256)
+    val color = varchar("color", 6)
+    val recurrence = enumerationByName<RecurrenceViewEnum>("every", 12)
+}
+
+class Habit(id: EntityID<Int>) : IntEntity(id) {
+    companion object : IntEntityClass<Habit>(Habits)
+
+    var name by Habits.name
+    var color by Habits.color
+    var recurrence by Habits.recurrence
+
+    val occurences by HabitOccurrence referrersOn HabitOccurrences.habit
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/DB/HabitOccurrences.kt b/src/main/kotlin/amine/bou/DB/HabitOccurrences.kt
new file mode 100644
index 0000000..ad0346f
--- /dev/null
+++ b/src/main/kotlin/amine/bou/DB/HabitOccurrences.kt
@@ -0,0 +1,20 @@
+package amine.bou.DB
+
+import org.jetbrains.exposed.dao.LongEntity
+import org.jetbrains.exposed.dao.LongEntityClass
+import org.jetbrains.exposed.dao.id.EntityID
+import org.jetbrains.exposed.dao.id.LongIdTable
+import org.jetbrains.exposed.sql.javatime.date
+
+
+object HabitOccurrences : LongIdTable() {
+    val occurence = date("date")
+    val habit = reference("habit", Habits)
+}
+
+class HabitOccurrence(id: EntityID<Long>) : LongEntity(id) {
+    companion object : LongEntityClass<HabitOccurrence>(HabitOccurrences)
+
+    var occurence by HabitOccurrences.occurence
+    var habit by Habit referencedOn HabitOccurrences.habit
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/DB/Migration.kt b/src/main/kotlin/amine/bou/DB/Migration.kt
new file mode 100644
index 0000000..8ebeac9
--- /dev/null
+++ b/src/main/kotlin/amine/bou/DB/Migration.kt
@@ -0,0 +1,18 @@
+package DB
+
+import org.jetbrains.exposed.dao.IntEntity
+import org.jetbrains.exposed.dao.IntEntityClass
+import org.jetbrains.exposed.dao.id.EntityID
+import org.jetbrains.exposed.dao.id.IntIdTable
+
+object Migrations : IntIdTable() {
+    val identifier = varchar("identifier", 256)
+    val done = bool("done").default(false)
+}
+
+class Migration(id: EntityID<Int>) : IntEntity(id) {
+    companion object : IntEntityClass<Migration>(Migrations)
+
+    var identifier by Migrations.identifier
+    var done by Migrations.done
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/controllers/HabitController.kt b/src/main/kotlin/amine/bou/controllers/HabitController.kt
new file mode 100644
index 0000000..5510159
--- /dev/null
+++ b/src/main/kotlin/amine/bou/controllers/HabitController.kt
@@ -0,0 +1,20 @@
+package amine.bou.controllers
+
+import amine.bou.DB.DB
+import amine.bou.models.HabitView
+
+class HabitController {
+    private val db: DB = DB()
+
+    fun createHabit(request: HabitView) = db.createHabit(request)
+
+    fun updateHabit(id: Int, request: HabitView) = db.updateHabit(id, request)
+
+    fun getAllHabits() = db.getAllHabits()
+
+    fun getOneHabit(id: Int) = db.getOneHabit(id)
+
+    fun deleteHabit(id: Int) = db.deleteHabit(id)
+
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/controllers/HabitOccurrenceController.kt b/src/main/kotlin/amine/bou/controllers/HabitOccurrenceController.kt
new file mode 100644
index 0000000..20272b6
--- /dev/null
+++ b/src/main/kotlin/amine/bou/controllers/HabitOccurrenceController.kt
@@ -0,0 +1,16 @@
+package amine.bou.controllers
+
+import amine.bou.DB.DB
+import amine.bou.DB.HabitOccurrences
+import amine.bou.models.HabitOccurrenceView
+import amine.bou.models.HabitView
+
+class HabitOccurrenceController {
+    private val db: DB = DB()
+
+    fun createOccurrence(habitId: Int, request: HabitOccurrenceView) = db.createOccurrence(habitId, request)
+
+    fun deleteOccurrence(habitId: Int, id: Long) = db.deleteOccurrence(habitId, id)
+
+
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/controllers/MigrationController.kt b/src/main/kotlin/amine/bou/controllers/MigrationController.kt
new file mode 100644
index 0000000..36a01cf
--- /dev/null
+++ b/src/main/kotlin/amine/bou/controllers/MigrationController.kt
@@ -0,0 +1,39 @@
+import DB.Migration
+import DB.Migrations
+import org.jetbrains.exposed.sql.transactions.transaction
+import org.jetbrains.exposed.sql.update
+
+class MigrationsController {
+    private val migrations: Map<String, () -> Boolean> = mapOf(
+    )
+
+    fun checkMigrationsToDo() {
+        this.migrations.forEach {
+            transaction {
+                val migrationWithName = Migration.find { Migrations.identifier eq it.key }.firstOrNull()
+                if (migrationWithName == null) {
+                    Migration.new {
+                        identifier = it.key
+                    }
+                    println("Migration ${it.key} will start now.")
+                    it.value()
+                    Migrations.update({Migrations.identifier eq it.key}) {
+                        it[done] = true
+                    }
+                    println("Migration ${it.key} done.")
+                } else if (!migrationWithName.done) {
+                    println("Migration ${it.key} not done yet. Redoing.")
+                    it.value()
+                    Migrations.update({Migrations.identifier eq it.key}) {
+                        it[done] = true
+                    }
+                    println("Migration ${it.key} done.")
+                } else {
+                    println("Migration ${it.key} already done.")
+                }
+            }
+        }
+    }
+
+   
+}
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/models/HabitOccurrenceView.kt b/src/main/kotlin/amine/bou/models/HabitOccurrenceView.kt
new file mode 100644
index 0000000..74bc5bc
--- /dev/null
+++ b/src/main/kotlin/amine/bou/models/HabitOccurrenceView.kt
@@ -0,0 +1,10 @@
+package amine.bou.models
+
+import amine.bou.DB.HabitOccurrence
+import io.ktor.server.http.*
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class HabitOccurrenceView(val id: Long?, val date: String)
+
+fun HabitOccurrence.toView(): HabitOccurrenceView = HabitOccurrenceView(this.id.value, this.occurence.toString())
diff --git a/src/main/kotlin/amine/bou/models/HabitView.kt b/src/main/kotlin/amine/bou/models/HabitView.kt
new file mode 100644
index 0000000..81645f6
--- /dev/null
+++ b/src/main/kotlin/amine/bou/models/HabitView.kt
@@ -0,0 +1,10 @@
+package amine.bou.models
+
+import amine.bou.DB.Habit
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class HabitView(val id: Int?, val name: String, val color: String, val recurrence: RecurrenceViewEnum, val occurrences: List<HabitOccurrenceView>)
+
+
+fun Habit.toView() : HabitView = HabitView(this.id.value, this.name, this.color, this.recurrence, this.occurences.map {it.toView()})
\ No newline at end of file
diff --git a/src/main/kotlin/amine/bou/models/RecurrenceViewEnum.kt b/src/main/kotlin/amine/bou/models/RecurrenceViewEnum.kt
new file mode 100644
index 0000000..61e652e
--- /dev/null
+++ b/src/main/kotlin/amine/bou/models/RecurrenceViewEnum.kt
@@ -0,0 +1,5 @@
+package amine.bou.models
+
+enum class RecurrenceViewEnum {
+    DAILY, MULTI_DAILY, WEEKLY, DO_NOT
+}
diff --git a/src/main/kotlin/amine/bou/plugins/Databases.kt b/src/main/kotlin/amine/bou/plugins/Databases.kt
new file mode 100644
index 0000000..1fd1ef7
--- /dev/null
+++ b/src/main/kotlin/amine/bou/plugins/Databases.kt
@@ -0,0 +1,25 @@
+package amine.bou.plugins
+
+import DB.Migrations
+import MigrationsController
+import amine.bou.DB.HabitOccurrences
+import amine.bou.DB.Habits
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.request.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import org.jetbrains.exposed.sql.*
+import org.jetbrains.exposed.sql.transactions.transaction
+
+fun Application.configureDatabases() {
+    var migrationsController = MigrationsController()
+
+    val database = Database.connect("jdbc:sqlite:habits.db", "org.sqlite.JDBC")
+    transaction {
+        SchemaUtils.create (Habits)
+        SchemaUtils.create (HabitOccurrences)
+        SchemaUtils.create (Migrations)
+        migrationsController.checkMigrationsToDo()
+    }
+}
diff --git a/src/main/kotlin/amine/bou/plugins/HTTP.kt b/src/main/kotlin/amine/bou/plugins/HTTP.kt
new file mode 100644
index 0000000..53bc4cb
--- /dev/null
+++ b/src/main/kotlin/amine/bou/plugins/HTTP.kt
@@ -0,0 +1,16 @@
+package amine.bou.plugins
+
+import io.ktor.server.application.*
+import io.ktor.server.plugins.compression.*
+
+fun Application.configureHTTP() {
+    install(Compression) {
+        gzip {
+            priority = 1.0
+        }
+        deflate {
+            priority = 10.0
+            minimumSize(1024) // condition
+        }
+    }
+}
diff --git a/src/main/kotlin/amine/bou/plugins/Routing.kt b/src/main/kotlin/amine/bou/plugins/Routing.kt
new file mode 100644
index 0000000..9b89f98
--- /dev/null
+++ b/src/main/kotlin/amine/bou/plugins/Routing.kt
@@ -0,0 +1,52 @@
+package amine.bou.plugins
+
+import amine.bou.controllers.HabitController
+import amine.bou.controllers.HabitOccurrenceController
+import amine.bou.models.HabitOccurrenceView
+import amine.bou.models.HabitView
+import io.ktor.server.application.*
+import io.ktor.server.request.*
+import io.ktor.server.resources.Resources
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import java.lang.Long.parseLong
+
+fun Application.configureRouting() {
+    val habitController = HabitController()
+    val habitOccurrenceController = HabitOccurrenceController()
+    install(Resources)
+    routing {
+        route("/habits") {
+            get {
+                call.respond(habitController.getAllHabits())
+            }
+
+            post {
+                call.respond(habitController.createHabit(call.receive<HabitView>()))
+            }
+
+            route("/{id}") {
+                get {
+                    call.respond(habitController.getOneHabit(Integer.parseInt(call.parameters["id"])))
+                }
+
+                put {
+                    call.respond(habitController.updateHabit(Integer.parseInt(call.parameters["id"]), call.receive<HabitView>()))
+                }
+
+                delete {
+                    call.respond(habitController.deleteHabit(Integer.parseInt(call.parameters["id"])))
+                }
+
+                post("/occurrence") {
+                    call.respond(habitOccurrenceController.createOccurrence(Integer.parseInt(call.parameters["id"]), call.receive<HabitOccurrenceView>()))
+                }
+
+                delete("/occurrence/{occId}") {
+                    call.respond(habitOccurrenceController.deleteOccurrence(Integer.parseInt(call.parameters["id"]), parseLong(call.parameters["occId"])))
+                }
+            }
+        }
+
+    }
+}
diff --git a/src/main/kotlin/amine/bou/plugins/Security.kt b/src/main/kotlin/amine/bou/plugins/Security.kt
new file mode 100644
index 0000000..4b2067c
--- /dev/null
+++ b/src/main/kotlin/amine/bou/plugins/Security.kt
@@ -0,0 +1,23 @@
+package amine.bou.plugins
+
+import io.ktor.server.application.*
+import io.ktor.server.auth.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.util.*
+
+fun Application.configureSecurity() {
+    authentication {
+        val myRealm = "MyRealm"
+        val usersInMyRealmToHA1: Map<String, ByteArray> = mapOf(
+            // pass="test", HA1=MD5("test:MyRealm:pass")="fb12475e62dedc5c2744d98eb73b8877"
+            "test" to hex("fb12475e62dedc5c2744d98eb73b8877")
+        )
+
+        digest("myDigestAuth") {
+            digestProvider { userName, realm ->
+                usersInMyRealmToHA1[userName]
+            }
+        }
+    }
+}
diff --git a/src/main/kotlin/amine/bou/plugins/Serialization.kt b/src/main/kotlin/amine/bou/plugins/Serialization.kt
new file mode 100644
index 0000000..3f413c9
--- /dev/null
+++ b/src/main/kotlin/amine/bou/plugins/Serialization.kt
@@ -0,0 +1,16 @@
+package amine.bou.plugins
+
+import io.ktor.serialization.kotlinx.json.*
+import io.ktor.server.application.*
+import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.response.*
+import kotlinx.serialization.json.Json
+
+fun Application.configureSerialization() {
+    install(ContentNegotiation) {
+        json(Json {
+            prettyPrint = true
+            isLenient = true
+        })
+    }
+}
diff --git a/src/main/resources/logback.xml b/src/main/resources/logback.xml
new file mode 100644
index 0000000..3e11d78
--- /dev/null
+++ b/src/main/resources/logback.xml
@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="trace">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>
\ No newline at end of file