diff --git a/app/src/main/java/com/planify/mobile/data/local/AppDatabase.kt b/app/src/main/java/com/planify/mobile/data/local/AppDatabase.kt
new file mode 100644
index 0000000..0c86eaf
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/AppDatabase.kt
@@ -0,0 +1,31 @@
+package com.planify.mobile.data.local
+
+import androidx.room.Database
+import androidx.room.RoomDatabase
+import com.planify.mobile.data.local.dao.ProjectDao
+import com.planify.mobile.data.local.dao.SectionDao
+import com.planify.mobile.data.local.dao.TaskDao
+import com.planify.mobile.data.local.entity.LabelEntity
+import com.planify.mobile.data.local.entity.ProjectEntity
+import com.planify.mobile.data.local.entity.ReminderEntity
+import com.planify.mobile.data.local.entity.SectionEntity
+import com.planify.mobile.data.local.entity.SourceEntity
+import com.planify.mobile.data.local.entity.TaskEntity
+
+@Database(
+    entities = [
+        TaskEntity::class,
+        ProjectEntity::class,
+        SectionEntity::class,
+        LabelEntity::class,
+        ReminderEntity::class,
+        SourceEntity::class,
+    ],
+    version = 1,
+    exportSchema = true,
+)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun taskDao(): TaskDao
+    abstract fun projectDao(): ProjectDao
+    abstract fun sectionDao(): SectionDao
+}
diff --git a/app/src/main/java/com/planify/mobile/data/local/dao/ProjectDao.kt b/app/src/main/java/com/planify/mobile/data/local/dao/ProjectDao.kt
new file mode 100644
index 0000000..09fc679
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/dao/ProjectDao.kt
@@ -0,0 +1,40 @@
+package com.planify.mobile.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Update
+import com.planify.mobile.data.local.entity.ProjectEntity
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface ProjectDao {
+
+    @Query("SELECT * FROM projects WHERE is_deleted = 0 ORDER BY child_order ASC")
+    fun getAllProjects(): Flow<List<ProjectEntity>>
+
+    @Query("SELECT * FROM projects WHERE is_favorite = 1 AND is_deleted = 0 ORDER BY child_order ASC")
+    fun getFavoriteProjects(): Flow<List<ProjectEntity>>
+
+    @Query("SELECT * FROM projects WHERE parent_id = :parentId AND is_deleted = 0 ORDER BY child_order ASC")
+    fun getSubProjects(parentId: String): Flow<List<ProjectEntity>>
+
+    @Query("SELECT * FROM projects WHERE id = :id")
+    suspend fun getById(id: String): ProjectEntity?
+
+    @Query("SELECT * FROM projects WHERE is_inbox = 1 LIMIT 1")
+    suspend fun getInboxProject(): ProjectEntity?
+
+    @Query("SELECT * FROM projects WHERE calendar_url = :calendarUrl LIMIT 1")
+    suspend fun getByCalendarUrl(calendarUrl: String): ProjectEntity?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insert(project: ProjectEntity)
+
+    @Update
+    suspend fun update(project: ProjectEntity)
+
+    @Query("UPDATE projects SET is_deleted = 1 WHERE id = :id")
+    suspend fun softDelete(id: String)
+}
diff --git a/app/src/main/java/com/planify/mobile/data/local/dao/SectionDao.kt b/app/src/main/java/com/planify/mobile/data/local/dao/SectionDao.kt
new file mode 100644
index 0000000..d51e3bf
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/dao/SectionDao.kt
@@ -0,0 +1,28 @@
+package com.planify.mobile.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Update
+import com.planify.mobile.data.local.entity.SectionEntity
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface SectionDao {
+
+    @Query("SELECT * FROM sections WHERE project_id = :projectId AND is_deleted = 0 ORDER BY `order` ASC")
+    fun getSectionsByProject(projectId: String): Flow<List<SectionEntity>>
+
+    @Query("SELECT * FROM sections WHERE id = :id")
+    suspend fun getById(id: String): SectionEntity?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insert(section: SectionEntity)
+
+    @Update
+    suspend fun update(section: SectionEntity)
+
+    @Query("UPDATE sections SET is_deleted = 1 WHERE id = :id")
+    suspend fun softDelete(id: String)
+}
diff --git a/app/src/main/java/com/planify/mobile/data/local/dao/TaskDao.kt b/app/src/main/java/com/planify/mobile/data/local/dao/TaskDao.kt
new file mode 100644
index 0000000..f4a05b0
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/dao/TaskDao.kt
@@ -0,0 +1,62 @@
+package com.planify.mobile.data.local.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import androidx.room.Update
+import com.planify.mobile.data.local.entity.TaskEntity
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface TaskDao {
+
+    @Query("SELECT * FROM tasks WHERE project_id = :projectId AND parent_id IS NULL AND is_deleted = 0 ORDER BY child_order ASC")
+    fun getTasksByProject(projectId: String): Flow<List<TaskEntity>>
+
+    @Query("SELECT * FROM tasks WHERE section_id = :sectionId AND parent_id IS NULL AND is_deleted = 0 ORDER BY child_order ASC")
+    fun getTasksBySection(sectionId: String): Flow<List<TaskEntity>>
+
+    @Query("""
+        SELECT t.* FROM tasks t
+        INNER JOIN projects p ON t.project_id = p.id
+        WHERE p.is_inbox = 1 AND t.parent_id IS NULL AND t.is_deleted = 0
+        ORDER BY t.child_order ASC
+    """)
+    fun getInboxTasks(): Flow<List<TaskEntity>>
+
+    @Query("""
+        SELECT * FROM tasks
+        WHERE date(due_date) = date('now') AND checked = 0 AND is_deleted = 0
+        ORDER BY child_order ASC
+    """)
+    fun getTodayTasks(): Flow<List<TaskEntity>>
+
+    @Query("""
+        SELECT * FROM tasks
+        WHERE date(due_date) < date('now') AND checked = 0 AND is_deleted = 0
+        ORDER BY due_date ASC
+    """)
+    fun getOverdueTasks(): Flow<List<TaskEntity>>
+
+    @Query("SELECT * FROM tasks WHERE parent_id = :parentId AND is_deleted = 0 ORDER BY child_order ASC")
+    fun getSubTasks(parentId: String): Flow<List<TaskEntity>>
+
+    @Query("SELECT * FROM tasks WHERE id = :id")
+    suspend fun getTaskById(id: String): TaskEntity?
+
+    @Query("SELECT * FROM tasks WHERE ical_url = :icalUrl LIMIT 1")
+    suspend fun getTaskByIcalUrl(icalUrl: String): TaskEntity?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insert(task: TaskEntity)
+
+    @Update
+    suspend fun update(task: TaskEntity)
+
+    @Query("UPDATE tasks SET checked = :checked, completed_at = :completedAt, updated_at = :updatedAt WHERE id = :id")
+    suspend fun setChecked(id: String, checked: Boolean, completedAt: String?, updatedAt: String)
+
+    @Query("UPDATE tasks SET is_deleted = 1, updated_at = :updatedAt WHERE id = :id")
+    suspend fun softDelete(id: String, updatedAt: String)
+}
diff --git a/app/src/main/java/com/planify/mobile/data/local/entity/LabelEntity.kt b/app/src/main/java/com/planify/mobile/data/local/entity/LabelEntity.kt
new file mode 100644
index 0000000..ae052bd
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/entity/LabelEntity.kt
@@ -0,0 +1,17 @@
+package com.planify.mobile.data.local.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "labels")
+data class LabelEntity(
+    @PrimaryKey val id: String,
+    val name: String,
+    val color: String,
+    val order: Int = 0,
+    @ColumnInfo(name = "source_id") val sourceId: String? = null,
+    @ColumnInfo(name = "backend_type") val backendType: String = "LOCAL",
+    @ColumnInfo(name = "is_favorite") val isFavorite: Boolean = false,
+    @ColumnInfo(name = "is_deleted") val isDeleted: Boolean = false,
+)
diff --git a/app/src/main/java/com/planify/mobile/data/local/entity/ProjectEntity.kt b/app/src/main/java/com/planify/mobile/data/local/entity/ProjectEntity.kt
new file mode 100644
index 0000000..242ad55
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/entity/ProjectEntity.kt
@@ -0,0 +1,26 @@
+package com.planify.mobile.data.local.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "projects")
+data class ProjectEntity(
+    @PrimaryKey val id: String,
+    val name: String,
+    val color: String = "#4CAF50",
+    val emoji: String? = null,
+    @ColumnInfo(name = "parent_id") val parentId: String? = null,
+    @ColumnInfo(name = "source_id") val sourceId: String? = null,
+    @ColumnInfo(name = "backend_type") val backendType: String = "LOCAL",
+    @ColumnInfo(name = "is_inbox") val isInbox: Boolean = false,
+    @ColumnInfo(name = "is_favorite") val isFavorite: Boolean = false,
+    @ColumnInfo(name = "is_archived") val isArchived: Boolean = false,
+    @ColumnInfo(name = "is_deleted") val isDeleted: Boolean = false,
+    @ColumnInfo(name = "view_style") val viewStyle: String = "LIST",
+    @ColumnInfo(name = "sorted_by") val sortedBy: String = "MANUAL",
+    @ColumnInfo(name = "sort_ascending") val sortAscending: Boolean = true,
+    @ColumnInfo(name = "child_order") val childOrder: Int = 0,
+    @ColumnInfo(name = "calendar_url") val calendarUrl: String? = null,
+    @ColumnInfo(name = "sync_id") val syncId: String? = null,
+)
diff --git a/app/src/main/java/com/planify/mobile/data/local/entity/ReminderEntity.kt b/app/src/main/java/com/planify/mobile/data/local/entity/ReminderEntity.kt
new file mode 100644
index 0000000..2f20dde
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/entity/ReminderEntity.kt
@@ -0,0 +1,27 @@
+package com.planify.mobile.data.local.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+
+@Entity(
+    tableName = "reminders",
+    foreignKeys = [
+        ForeignKey(
+            entity = TaskEntity::class,
+            parentColumns = ["id"],
+            childColumns = ["task_id"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ],
+    indices = [Index("task_id")]
+)
+data class ReminderEntity(
+    @PrimaryKey val id: String,
+    @ColumnInfo(name = "task_id") val taskId: String,
+    val type: String,
+    @ColumnInfo(name = "due_date") val dueDate: String? = null,
+    @ColumnInfo(name = "minutes_offset") val minutesOffset: Int? = null,
+)
diff --git a/app/src/main/java/com/planify/mobile/data/local/entity/SectionEntity.kt b/app/src/main/java/com/planify/mobile/data/local/entity/SectionEntity.kt
new file mode 100644
index 0000000..b91b1c1
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/entity/SectionEntity.kt
@@ -0,0 +1,31 @@
+package com.planify.mobile.data.local.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+
+@Entity(
+    tableName = "sections",
+    foreignKeys = [
+        ForeignKey(
+            entity = ProjectEntity::class,
+            parentColumns = ["id"],
+            childColumns = ["project_id"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ],
+    indices = [Index("project_id")]
+)
+data class SectionEntity(
+    @PrimaryKey val id: String,
+    val name: String,
+    @ColumnInfo(name = "project_id") val projectId: String,
+    val order: Int = 0,
+    @ColumnInfo(name = "is_archived") val isArchived: Boolean = false,
+    @ColumnInfo(name = "is_deleted") val isDeleted: Boolean = false,
+    val collapsed: Boolean = false,
+    @ColumnInfo(name = "ical_url") val icalUrl: String? = null,
+    val etag: String? = null,
+)
diff --git a/app/src/main/java/com/planify/mobile/data/local/entity/SourceEntity.kt b/app/src/main/java/com/planify/mobile/data/local/entity/SourceEntity.kt
new file mode 100644
index 0000000..5522b04
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/entity/SourceEntity.kt
@@ -0,0 +1,17 @@
+package com.planify.mobile.data.local.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "sources")
+data class SourceEntity(
+    @PrimaryKey val id: String,
+    val type: String,
+    @ColumnInfo(name = "display_name") val displayName: String,
+    @ColumnInfo(name = "added_at") val addedAt: String,
+    @ColumnInfo(name = "updated_at") val updatedAt: String,
+    @ColumnInfo(name = "is_visible") val isVisible: Boolean = true,
+    @ColumnInfo(name = "last_sync") val lastSync: String? = null,
+    val data: String = "{}",
+)
diff --git a/app/src/main/java/com/planify/mobile/data/local/entity/TaskEntity.kt b/app/src/main/java/com/planify/mobile/data/local/entity/TaskEntity.kt
new file mode 100644
index 0000000..868c8ff
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/data/local/entity/TaskEntity.kt
@@ -0,0 +1,48 @@
+package com.planify.mobile.data.local.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+
+@Entity(
+    tableName = "tasks",
+    foreignKeys = [
+        ForeignKey(
+            entity = ProjectEntity::class,
+            parentColumns = ["id"],
+            childColumns = ["project_id"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ],
+    indices = [
+        Index("project_id"),
+        Index("section_id"),
+        Index("parent_id")
+    ]
+)
+data class TaskEntity(
+    @PrimaryKey val id: String,
+    val content: String,
+    val description: String = "",
+    @ColumnInfo(name = "project_id") val projectId: String,
+    @ColumnInfo(name = "section_id") val sectionId: String? = null,
+    @ColumnInfo(name = "parent_id") val parentId: String? = null,
+    val priority: Int = 4,
+    val checked: Boolean = false,
+    @ColumnInfo(name = "due_date") val dueDate: String? = null,
+    @ColumnInfo(name = "deadline_date") val deadlineDate: String? = null,
+    val labels: String = "[]",
+    val pinned: Boolean = false,
+    val collapsed: Boolean = false,
+    @ColumnInfo(name = "child_order") val childOrder: Int = 0,
+    @ColumnInfo(name = "added_at") val addedAt: String = "",
+    @ColumnInfo(name = "updated_at") val updatedAt: String = "",
+    @ColumnInfo(name = "completed_at") val completedAt: String? = null,
+    @ColumnInfo(name = "item_type") val itemType: String = "TASK",
+    @ColumnInfo(name = "calendar_event_uid") val calendarEventUid: String? = null,
+    @ColumnInfo(name = "ical_url") val icalUrl: String? = null,
+    val etag: String? = null,
+    @ColumnInfo(name = "responsible_uid") val responsibleUid: String? = null,
+)
diff --git a/app/src/main/java/com/planify/mobile/di/DatabaseModule.kt b/app/src/main/java/com/planify/mobile/di/DatabaseModule.kt
new file mode 100644
index 0000000..e8d5238
--- /dev/null
+++ b/app/src/main/java/com/planify/mobile/di/DatabaseModule.kt
@@ -0,0 +1,27 @@
+package com.planify.mobile.di
+
+import android.content.Context
+import androidx.room.Room
+import com.planify.mobile.data.local.AppDatabase
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object DatabaseModule {
+
+    @Provides
+    @Singleton
+    fun provideDatabase(@ApplicationContext context: Context): AppDatabase =
+        Room.databaseBuilder(context, AppDatabase::class.java, "planify.db")
+            .fallbackToDestructiveMigration()
+            .build()
+
+    @Provides fun provideTaskDao(db: AppDatabase) = db.taskDao()
+    @Provides fun provideProjectDao(db: AppDatabase) = db.projectDao()
+    @Provides fun provideSectionDao(db: AppDatabase) = db.sectionDao()
+}