diff --git a/src/data/entities.rs b/src/data/entities.rs
index 401e5b3..f46bcb0 100644
--- a/src/data/entities.rs
+++ b/src/data/entities.rs
@@ -20,6 +20,17 @@ pub struct WordData {
     pub additional: HashMap<String, String>,
     pub group_id: Id,
 }
+
+impl EntityData for WordData {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
 #[derive(Clone)]
 pub struct WordGroup {
     pub id: Id,
@@ -168,49 +179,15 @@ impl CardStatistics {
     }
 }
 
-#[derive(Clone)]
-pub struct Entity<E, R: Repository<E>> {
-    pub(crate) repo: R,
+#[derive(Clone, Copy)]
+pub struct EntityHandle<E> {
     pub(crate) _phantom: PhantomData<E>,
-    pub(crate) inner: EntityInner,
-}
-
-#[derive(Clone)]
-pub(crate) struct EntityInner {
     pub(crate) id: Id,
     pub(crate) real: bool,
+    pub(crate) index: u32,
 }
 
-impl<E, R: Repository<E>> Entity<E, R> {
-    pub fn load(&self) -> EntityAccess<E, R> {
-        let clone = *self.clone();
-        let repo = &self.repo;
-        let value = repo.get(self.inner.id).unwrap();
-        EntityAccess { value, entity: clone, }
-    }
-}
-
-pub struct EntityAccess<E, R: Repository<E>> {
-    entity: Entity<E, R>,
-    value: E,
-}
-
-impl<E, R: Repository<E>> Deref for EntityAccess<E, R> {
-    type Target = E;
-
-    fn deref(&self) -> &Self::Target {
-        &self.value
-    }
-}
-
-impl<E, R: Repository<E>> DerefMut for EntityAccess<E, R> {
-    fn deref_mut(&mut self) -> &mut E {
-        &mut self.value
-    }
-}
-
-pub trait Repository<T> {
-    fn get(&self, id: Id) -> Option<T>;
-    fn create(&mut self, new: T) -> Entity<T, impl Repository<T>>;
-    fn save(&mut self, entity: EntityInner) -> MaybeError;
+pub trait EntityData{
+    fn id(&self) -> Id;
+    fn set_id(&mut self, id: Id);
 }
diff --git a/src/data/repositories.rs b/src/data/repositories.rs
index dad8999..ee3fa58 100644
--- a/src/data/repositories.rs
+++ b/src/data/repositories.rs
@@ -1,46 +1,272 @@
 use crate::data::Id;
-use crate::data::entities::{Entity, EntityInner, Repository, WordData};
+use crate::data::entities::{EntityData, EntityHandle, WordData};
 use crate::notification::MaybeError;
 use parking_lot::{Mutex, RwLock};
 use rusqlite::Connection;
 use std::marker::PhantomData;
+use std::ops::{Deref, DerefMut};
 use std::sync::Arc;
+use iced::application::IntoBoot;
+use rusqlite::fallible_iterator::Iterator;
+
+pub trait Repository<T, D> where D : DbLayer<T> {
+    fn get(&self, handle: &mut EntityHandle<T>) -> Option<T>;
+    fn get_ref(&self, handle: &mut EntityHandle<T>) -> Option<&T>;
+    fn get_mut(&mut self, handle: &mut EntityHandle<T>) -> Option<&mut T>;
+    fn handle_by_id(&self, id: Id) -> EntityHandle<T>;
+    fn create(&mut self, new: T) -> EntityHandle<T>;
+    fn save(&mut self, entity: &mut EntityHandle<T>) -> MaybeError;
+    fn delete(&mut self, handle: EntityHandle<T>) -> MaybeError;
+    fn init(&mut self) -> MaybeError;
+    fn reload(&mut self) -> MaybeError;
+}
+
+pub trait BatchedRepository<T, D> where D : BatchedDbLayer<T>, T: EntityData
+{
+    fn save_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError;
+    fn delete_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError;
+
+}
+
+pub trait DbLayer<T> {
+    fn write_entity(&self, entity: &T, connection: &Connection) -> MaybeError;
+    fn add_entity(&mut self, entity: &mut T, connection: &Connection) -> MaybeError;
+    fn delete_entity(&mut self, id: Id, connection: &Connection) -> MaybeError;
+    fn load_all(&self, storage:  &mut Vec<T>, connection: &Connection) -> MaybeError;
+}
+
+pub trait BatchedDbLayer<T> where T : EntityData{
+    fn delete_many(&mut self, ids: &[Id], connection: &Connection) -> MaybeError;
+    fn add_many_entity(&mut self, entity: &mut [T], connection: &Connection) -> MaybeError;
+}
+
 
 #[derive(Clone)]
-pub struct WordRepository {
-    inner: Arc<RwLock<WordRepositoryInner>>,
+pub struct DataRepository<T, D> {
+    inner: Arc<RwLock<DataRepositoryInner<T, D>>>,
 }
 
-pub struct WordRepositoryInner {
-    cache: Vec<WordData>,
-    temporal: Vec<Entity<WordData, WordRepository>>,
+pub struct DataRepositoryInner<T, D> {
+    cache: Vec<T>,
+    temporal: Vec<T>,
     next_temporal: u32,
     connection: Arc<Mutex<Connection>>,
+    data_layer: D,
 }
 
-impl Repository<WordData> for WordRepository {
-    fn get(&self, id: Id) -> Option<WordData> {
-        let inner = self.inner.read();
-        Some(inner.cache[inner.cache.binary_search_by(|w| w.id.cmp(&id)).ok()?].clone())
+impl<T, D> Deref for DataRepository<T, D> {
+    type Target = Arc<RwLock<DataRepositoryInner<T, D>>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl<T: EntityData + Clone, D: DbLayer<T>> Repository<T, D> for DataRepositoryInner<T, D> {
+    fn get(&self, handle: &mut EntityHandle<T>) -> Option<T> {
+        let slice = if handle.real {
+            self.cache.as_slice()
+        } else {
+            self.temporal.as_slice()
+        };
+        let index = fast_position_of(slice, handle)?;
+        Some(slice[index].clone())
     }
 
-    fn create(&mut self, new: WordData) -> Entity<WordData, WordRepository> {
-        let mut inner = self.inner.write();
-        let next_temporal = inner.next_temporal;
-        inner.next_temporal += 1;
-        drop(inner);
-        let entity = Entity {
-            inner: EntityInner {
-                id: next_temporal.into(),
-                real: false,
-            },
-            repo: self.clone(),
+    fn get_ref(&self, handle: &mut EntityHandle<T>) -> Option<&T> {
+        let slice = if handle.real {
+            self.cache.as_slice()
+        } else {
+            self.temporal.as_slice()
+        };
+        let index = fast_position_of(slice, handle)?;
+        Some(&slice[index])
+    }
+
+    fn get_mut(&mut self, handle: &mut EntityHandle<T>) -> Option<&mut T> {
+        let slice = if handle.real {
+            self.cache.as_mut_slice()
+        } else {
+            self.temporal.as_mut_slice()
+        };
+        let index = fast_position_of(slice, handle)?;
+        Some(&mut slice[index])
+    }
+
+    fn handle_by_id(&self, id: Id) -> EntityHandle<T> {
+        EntityHandle{
+            _phantom: Default::default(),
+            id,
+            real: true,
+            index: id.0,
+        }
+    }
+
+    // fn get_static(&self, mut handle: EntityHandle<T>) -> Option<T> {
+    //     let slice = if handle.real {
+    //         self.cache.as_slice()
+    //     } else {
+    //         self.temporal.as_slice()
+    //     };
+    //     let index = fast_position_of(slice, &mut handle)?;
+    //     Some(slice[index].clone())
+    // }
+    //
+    // fn get_ref_static(&self, mut handle: EntityHandle<T>) -> Option<&T> {
+    //     let slice = if handle.real {
+    //         self.cache.as_slice()
+    //     } else {
+    //         self.temporal.as_slice()
+    //     };
+    //     let index = fast_position_of(slice, &mut handle)?;
+    //     Some(&slice[index])
+    // }
+    //
+    // fn get_mut_static(&mut self, mut handle: EntityHandle<T>) -> Option<&mut T> {
+    //     let slice = if handle.real {
+    //         self.cache.as_mut_slice()
+    //     } else {
+    //         self.temporal.as_mut_slice()
+    //     };
+    //     let index = fast_position_of(slice, &mut handle)?;
+    //     Some(&mut slice[index])
+    // }
+
+    fn create(&mut self, mut new: T) -> EntityHandle<T> {
+        let next_temporal = self.next_temporal;
+        self.next_temporal += 1;
+        let entity = EntityHandle {
+            id: next_temporal.into(),
+            real: false,
+            index: self.temporal.len() as u32,
             _phantom: PhantomData,
         };
+        new.set_id(entity.id);
+        self.temporal.push(new);
         entity
     }
 
-    fn save(&mut self, entity: EntityInner) -> MaybeError {
-        todo!()
+    fn save(&mut self, entity: &mut EntityHandle<T>) -> MaybeError {
+        if entity.real {
+            let data = self.get_ref(entity).unwrap();
+            self.data_layer.write_entity(data, &self.connection.lock())?;
+        } else {
+            let index = fast_position_of(self.temporal.as_slice(), entity).unwrap();
+            let mut value = self.temporal.remove(index);
+            self.data_layer.add_entity(&mut value, &self.connection.lock())?;
+            entity.real = true;
+            entity.id = value.id();
+            entity.index = self.cache.len() as u32;
+            self.cache.push(value);
+        }
+
+        Ok(())
+    }
+
+    fn delete(&mut self, mut handle: EntityHandle<T>) -> MaybeError {
+
+        let vec = if handle.real {
+            self.data_layer.delete_entity(handle.id, &self.connection.lock())?;
+            &mut self.cache
+        } else {
+            &mut self.temporal
+        };
+
+        let index = fast_position_of(vec.as_slice(), &mut handle).unwrap();
+        vec.remove(index);
+        Ok(())
+    }
+
+    fn init(&mut self) -> MaybeError {
+        self.data_layer.load_all(&mut self.cache, &self.connection.lock())?;
+        Ok(())
+    }
+
+    fn reload(&mut self) -> MaybeError {
+        self.cache.clear();
+        self.temporal.clear();
+        self.init()?;
+        Ok(())
     }
 }
+impl<T: EntityData + Clone, D: BatchedDbLayer<T>> BatchedRepository<T, D> for DataRepositoryInner<T, D> {
+    fn save_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError {
+        todo!()
+    }
+
+    fn delete_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError {
+        let mut temp = Vec::with_capacity(handles.len() / 2);
+        let mut cached = Vec::with_capacity(handles.len() / 2);
+        let mut cell = 0;
+        handles.sort_by(|a, b| {a.id.cmp(&b.id)});
+        handles.iter().for_each(|handle| if handle.real { cached.push(handle.id)} else {
+            temp.push(handle.id)
+        });
+
+        let len = temp.len();
+        self.temporal.retain(|x| {
+            if cell == len { return true; }
+            let find = temp[cell];
+            let remove = x.id() == find;
+            if remove { cell += 1; }
+            !remove
+        });
+        self.data_layer.delete_many(cached.as_slice(), &self.connection.lock())?;
+        let len = cached.len();
+        cell = 0;
+        self.cache.retain(|x| {
+            if cell == len { return true; }
+            let find = cached[cell];
+            let remove = x.id() == find;
+            if remove { cell += 1; }
+            !remove
+        });
+
+       Ok(())
+    }
+}
+
+pub fn fast_position_of<E: EntityData>(
+    storage: &[E],
+    handle: &mut EntityHandle<E>,
+) -> Option<usize> {
+    if storage.is_empty() {
+        return None;
+    }
+
+    let max_idx = storage.len() - 1;
+    let upper = (handle.index as usize).min(max_idx);
+    let peek = storage[upper].id();
+
+    if peek == handle.id {
+        handle.index = upper as u32;
+        return Some(upper);
+    }
+
+    if peek.0 < handle.id.0 {
+        return None;
+    }
+
+    let target_id_val = handle.id.0 as i64;
+    let peek_val = peek.0 as i64;
+    let delta = peek_val - target_id_val;
+
+    let new_index = (upper as i64 - delta).max(0) as usize;
+
+    if storage[new_index].id() == handle.id {
+        handle.index = new_index as u32;
+        return Some(new_index);
+    }
+
+    if new_index == upper {
+        return None;
+    }
+
+    let index = storage[new_index..upper]
+        .binary_search_by(|e| e.id().cmp(&handle.id))
+        .ok()?
+        + new_index;
+
+    handle.index = index as u32;
+    Some(index)
+}
diff --git a/src/main.rs b/src/main.rs
index 34b8108..58e8c7a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@ mod navigation;
 pub mod notification;
 mod pages;
 mod styling;
+pub mod tests;
 
 use crate::app::start;
 use mimalloc::MiMalloc;
diff --git a/src/tests.rs b/src/tests.rs
new file mode 100644
index 0000000..db4efda
--- /dev/null
+++ b/src/tests.rs
@@ -0,0 +1,92 @@
+#[cfg(test)]
+mod mod_tests {
+    use crate::data::Id;
+    use crate::data::entities::{EntityData, EntityHandle};
+    use crate::data::repositories::fast_position_of;
+
+    struct ProtoEntity {
+        id: Id,
+        _data: i128,
+    }
+    impl EntityData for ProtoEntity {
+        fn id(&self) -> Id {
+            self.id
+        }
+
+        fn set_id(&mut self, id: Id) {
+            self.id = id;
+        }
+    }
+
+    impl ProtoEntity {
+        fn new(n: i128) -> Self {
+            Self {
+                id: (n as u32).into(),
+                _data: n,
+            }
+        }
+    }
+
+    #[test]
+    fn search_direct() {
+        let mut entity = EntityHandle {
+            _phantom: Default::default(),
+            id: 8.into(),
+            real: true,
+            index: 3,
+        };
+        assert_eq!(
+            fast_position_of(&[1, 2, 3, 8, 9, 12].map(ProtoEntity::new), &mut entity),
+            Some(3)
+        );
+    }
+
+    #[test]
+    fn search_0() {
+        let mut entity = EntityHandle {
+            _phantom: Default::default(),
+            id: 8.into(),
+            real: true,
+            index: 4,
+        };
+        assert_eq!(
+            fast_position_of(&[1, 2, 3, 8, 9, 12].map(ProtoEntity::new), &mut entity),
+            Some(3)
+        );
+    }
+
+    #[test]
+    fn search_1() {
+        let mut entity = EntityHandle {
+            _phantom: Default::default(),
+            id: 9.into(),
+            real: true,
+            index: 5,
+        };
+        assert_eq!(
+            fast_position_of(&[1, 2, 3, 8, 9, 12].map(ProtoEntity::new), &mut entity),
+            Some(1)
+        );
+    }
+
+    #[test]
+    fn search_2() {
+        let mut entity = EntityHandle {
+            _phantom: Default::default(),
+            id: 106.into(),
+            real: true,
+            index: 5,
+        };
+        assert_eq!(
+            fast_position_of(
+                &[
+                    1, 2, 3, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 105, 106, 107,
+                    108, 109, 110
+                ]
+                .map(ProtoEntity::new),
+                &mut entity
+            ),
+            Some(1)
+        );
+    }
+}