diff --git a/src/core/deck.rs b/src/core/deck.rs
index 3bb2cd3..b09e41c 100644
--- a/src/core/deck.rs
+++ b/src/core/deck.rs
@@ -15,7 +15,7 @@ use std::sync::Arc;
 #[derive(Clone)]
 pub struct DeckData {
     pub(crate) words: Vec<WordData>,
-    pub(crate) set: Vec<CardStatistics>,
+    pub(crate) set: Vec<CardState>,
     current_word_index: Option<usize>,
     state: Arc<Mutex<AppState>>,
     order_module: OrderModule,
@@ -54,7 +54,7 @@ impl DeckData {
         })
     }
 
-    pub fn next(&mut self) -> (WordData, CardStatistics) {
+    pub fn next(&mut self) -> (WordData, CardState) {
         let index = match self.order_module {
             SemiRandomSRS(ref mut module) => {
                 if !module.initialized {
@@ -88,7 +88,7 @@ impl DeckData {
     }
     pub fn open(&mut self, status: WordOpenMode) -> MaybeError {
         if let Some(index) = self.current_word_index {
-            let word: &mut CardStatistics = &mut self.set[index];
+            let word: &mut CardState = &mut self.set[index];
             let old_score = word.score;
             word.update(status);
             let new_score = word.score;
diff --git a/src/core/srs.rs b/src/core/srs.rs
index 7bfd811..bd85444 100644
--- a/src/core/srs.rs
+++ b/src/core/srs.rs
@@ -1,4 +1,4 @@
-use crate::data::entities::CardStatistics;
+use crate::data::entities::CardState;
 use chrono::{Local, TimeDelta};
 use fsrs::FSRS;
 use rand::distr::weighted::WeightedIndex;
@@ -31,9 +31,9 @@ pub enum OrderModule {
     Fsrs(FsrsModule),
 }
 pub trait SRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize;
-    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &mut CardStatistics);
-    fn init(&mut self, set: &[CardStatistics]);
+    fn next(&mut self, set: &[CardState]) -> usize;
+    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &mut CardState);
+    fn init(&mut self, set: &[CardState]);
 }
 #[derive(Clone)]
 pub struct RandomSRSModule {
@@ -49,7 +49,7 @@ impl RandomSRSModule {
     }
 }
 impl SRSModule for RandomSRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize {
+    fn next(&mut self, set: &[CardState]) -> usize {
         match self.basket.pop() {
             Some(index) => index,
             None => {
@@ -60,9 +60,9 @@ impl SRSModule for RandomSRSModule {
         }
     }
 
-    fn open(&mut self, _: WordOpenMode, _: usize, _: &mut CardStatistics) {}
+    fn open(&mut self, _: WordOpenMode, _: usize, _: &mut CardState) {}
 
-    fn init(&mut self, set: &[CardStatistics]) {
+    fn init(&mut self, set: &[CardState]) {
         self.initialized = true;
         self.basket = (0..set.len()).collect::<Vec<usize>>();
         self.basket.shuffle(&mut rand::rng())
@@ -86,7 +86,7 @@ impl SemiRandomSRSModule {
     }
 }
 impl SRSModule for SemiRandomSRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize {
+    fn next(&mut self, set: &[CardState]) -> usize {
         let index = self.last_weights.sample(&mut self.generator);
 
         if self.history.contains(&index) && self.history.len() != 1 {
@@ -100,13 +100,13 @@ impl SRSModule for SemiRandomSRSModule {
 
         index
     }
-    fn open(&mut self, _: WordOpenMode, index: usize, word: &mut CardStatistics) {
+    fn open(&mut self, _: WordOpenMode, index: usize, word: &mut CardState) {
         let new_weight = (100.0 / word.calculated_score()).powf(2.0);
         self.last_weights
             .update_weights(&[(index, &new_weight)])
             .expect("update weights error");
     }
-    fn init(&mut self, set: &[CardStatistics]) {
+    fn init(&mut self, set: &[CardState]) {
         self.initialized = true;
         let weights = set
             .iter()
@@ -116,7 +116,7 @@ impl SRSModule for SemiRandomSRSModule {
     }
 }
 impl SemiRandomSRSModule {
-    fn history_len(&self, set: &[CardStatistics]) -> usize {
+    fn history_len(&self, set: &[CardState]) -> usize {
         ((set.len() as f32 * MAX_HISTORY_LEN_PART) as usize).clamp(1, MAX_HISTORY_LEN)
     }
 }
@@ -130,7 +130,7 @@ pub struct WorstWordsSRSModule {
     rounds_count: u8,
 }
 impl SRSModule for WorstWordsSRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize {
+    fn next(&mut self, set: &[CardState]) -> usize {
         if self.rounds_remaining == 0 {
             self.fill_pool(set);
             self.rounds_remaining = self.rounds_count;
@@ -146,9 +146,9 @@ impl SRSModule for WorstWordsSRSModule {
         }
     }
 
-    fn open(&mut self, _: WordOpenMode, _: usize, _: &mut CardStatistics) {}
+    fn open(&mut self, _: WordOpenMode, _: usize, _: &mut CardState) {}
 
-    fn init(&mut self, _: &[CardStatistics]) {
+    fn init(&mut self, _: &[CardState]) {
         self.initialized = true;
     }
 }
@@ -163,7 +163,7 @@ impl WorstWordsSRSModule {
             queue: vec![],
         }
     }
-    fn fill_pool(&mut self, set: &[CardStatistics]) {
+    fn fill_pool(&mut self, set: &[CardState]) {
         let mut sorted = set.iter().enumerate().collect::<Vec<_>>();
         sorted.sort_by_key(|c| c.1.score);
         let mut worst = sorted[0..self.pool_size]
@@ -187,7 +187,7 @@ pub struct FsrsModule {
 }
 
 impl SRSModule for FsrsModule {
-    fn next(&mut self, _: &[CardStatistics]) -> usize {
+    fn next(&mut self, _: &[CardState]) -> usize {
         if self.current_group.is_empty() {
             self.fill_partial_pool();
         }
@@ -200,7 +200,7 @@ impl SRSModule for FsrsModule {
         self.queue.pop().unwrap_or(0)
     }
 
-    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &mut CardStatistics) {
+    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &mut CardState) {
         let today = Local::now().date_naive();
         let delta = today - updated_word.fsrs_opened;
         let delta_days = delta.num_days();
@@ -233,7 +233,7 @@ impl SRSModule for FsrsModule {
         }
     }
 
-    fn init(&mut self, set: &[CardStatistics]) {
+    fn init(&mut self, set: &[CardState]) {
         self.rng = rng();
         let today = Local::now().date_naive();
         self.today_set = set
diff --git a/src/data/entities.rs b/src/data/entities.rs
index 557866b..3c025db 100644
--- a/src/data/entities.rs
+++ b/src/data/entities.rs
@@ -145,7 +145,7 @@ impl DeckSettings {
 }
 
 #[derive(Clone, PartialEq)]
-pub struct CardStatistics {
+pub struct CardState {
     pub id: Id,
     pub word_id: Id,
     pub set_id: Id,
@@ -155,7 +155,7 @@ pub struct CardStatistics {
     pub fsrs_memory: Option<MemoryState>,
     pub fsrs_open_day: NaiveDate,
 }
-impl CardStatistics {
+impl CardState {
     pub fn update(&mut self, status: WordOpenMode) {
         match status {
             WordOpenMode::Easy => {
diff --git a/src/data_provider/card_states.rs b/src/data_provider/card_states.rs
index 0af64da..7db49eb 100644
--- a/src/data_provider/card_states.rs
+++ b/src/data_provider/card_states.rs
@@ -1,22 +1,72 @@
-use crate::data::entities::{CardStatistics, DeckSettings};
+use crate::data::entities::{CardState, DeckSettings};
+use crate::data_provider::TableAccessQuerySet;
 use crate::notification::NotificationData::{DbLoadError, DbSaveError};
 use crate::notification::{MaybeError, NotificationData};
 use chrono::NaiveDate;
 use fsrs::MemoryState;
 use log::info;
-use rusqlite::{Connection, params};
+use rusqlite::{Connection, Error, Params, Row, params};
 use std::time::Instant;
 
+pub struct CardStatesQuerySet;
+impl TableAccessQuerySet<CardState> for CardStatesQuerySet {
+    fn load() -> &'static str {
+        "INSERT INTO states (word_id, set_id, score, last_opened, fsrs_opened, fsrs_memory, fsrs_open_day) VALUES (?1, ?2, ?3, ?4)"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE states SET score = ?1, last_opened = ?2 WHERE id = ?3"
+    }
+
+    fn add() -> &'static str {
+        todo!()
+    }
+
+    fn name() -> &'static str {
+        "states"
+    }
+
+    fn from_sql(row: &Row) -> Result<CardState, Error> {
+        Ok(CardState {
+            id: row.get(0)?,
+            word_id: row.get(1)?,
+            set_id: set.id,
+            score: row.get(2)?,
+            fsrs_opened: NaiveDate::from_epoch_days(row.get::<usize, i32>(4)?)
+                .expect("Incorrect date encoding"),
+            fsrs_memory: get_memory(row.get(5)?),
+            last_open: row.get(3)?,
+            fsrs_open_day: NaiveDate::from_epoch_days(row.get::<usize, i32>(6)?)
+                .expect("Incorrect date encoding"),
+        })
+    }
+
+    fn insert_params(entity: &CardState) -> impl Params {
+        (
+            entity.word_id,
+            entity.set_id,
+            entity.score,
+            entity.last_open.timestamp(),
+            entity.fsrs_opened.to_epoch_days(),
+            memory_to_i64(&entity.fsrs_memory),
+            entity.fsrs_open_day.to_epoch_days(),
+        )
+    }
+
+    fn update_params(entity: &CardState) -> impl Params {
+        (entity.score, entity.last_open.timestamp(), entity.id)
+    }
+}
 pub fn load_stats_of_deck(
     set: &DeckSettings,
     connection: &Connection,
-) -> Result<Vec<CardStatistics>, NotificationData> {
+) -> Result<Vec<CardState>, NotificationData> {
     let mut stmt = connection
         .prepare("SELECT id, word_id, score, last_opened, fsrs_opened, fsrs_memory, fsrs_open_day FROM states WHERE set_id = ?1")
         .expect("Failed to prepare state query");
     let iter = stmt
         .query_map((set.id,), |row| {
-            Ok(CardStatistics {
+            Ok(CardState {
                 id: row.get(0)?,
                 word_id: row.get(1)?,
                 set_id: set.id,
@@ -55,7 +105,7 @@ fn memory_to_i64(value: &Option<MemoryState>) -> i64 {
     value.stability.to_bits() as i64 | ((value.difficulty.to_bits() as i64) << 32)
 }
 
-pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection) -> MaybeError {
+pub fn add_stat_list(stats: &mut [CardState], connection: &mut Connection) -> MaybeError {
     let time = Instant::now();
     let tx = connection
         .transaction()
@@ -96,7 +146,7 @@ pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection)
     Ok(())
 }
 
-pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) -> MaybeError {
+pub fn update_stat_score(stat: &CardState, connection: &Connection) -> MaybeError {
     let time = Instant::now();
 
     connection
@@ -109,7 +159,7 @@ pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) -> Mayb
     Ok(())
 }
 
-pub fn delete_stats(stat: &[CardStatistics], connection: &Connection) -> MaybeError {
+pub fn delete_stats(stat: &[CardState], connection: &Connection) -> MaybeError {
     if stat.is_empty() {
         return Ok(());
     }
diff --git a/src/data_provider/mod.rs b/src/data_provider/mod.rs
index 998b1f0..1c54a7a 100644
--- a/src/data_provider/mod.rs
+++ b/src/data_provider/mod.rs
@@ -1,11 +1,10 @@
-use crate::core::srs::OrderMode;
 use crate::data::Id;
-use crate::data::entities::{DeckSettings, EntityData};
+use crate::data::entities::{CardState, EntityData};
 use crate::data::repositories::{BatchedDbLayer, DbLayer};
 use crate::notification::MaybeError;
 use crate::notification::NotificationData::{DbLoadError, DbSaveError};
 use log::info;
-use rusqlite::{Connection, Params, Row, params};
+use rusqlite::{Connection, Error, Params, Row};
 use std::marker::PhantomData;
 use std::time::Instant;
 
@@ -24,7 +23,7 @@ pub trait TableAccessQuerySet<T> {
     fn save() -> &'static str;
     fn add() -> &'static str;
     fn name() -> &'static str;
-    fn from_sql(row: &Row) -> T;
+    fn from_sql(row: &Row) -> Result<T, Error>;
     fn insert_params(entity: &T) -> impl Params;
     fn update_params(entity: &T) -> impl Params;
 }
@@ -33,8 +32,7 @@ pub struct SqliteDbLayer<T, Q>
 where
     Q: TableAccessQuerySet<T>,
 {
-    query_set: Q,
-    _phantom: PhantomData<T>,
+    _phantom: PhantomData<(T, Q)>,
 }
 
 impl<T: EntityData, Q: TableAccessQuerySet<T>> DbLayer<T> for SqliteDbLayer<T, Q> {
diff --git a/src/pages/repetition.rs b/src/pages/repetition.rs
index 15f0a70..cbf5d91 100644
--- a/src/pages/repetition.rs
+++ b/src/pages/repetition.rs
@@ -2,7 +2,7 @@ use crate::app::AppState;
 use crate::core::deck::DeckData;
 use crate::core::srs::WordOpenMode;
 use crate::data::Id;
-use crate::data::entities::{CardStatistics, DeckSettings, WordData};
+use crate::data::entities::{CardState, DeckSettings, WordData};
 use crate::data_provider::voice::get_voice;
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{KeyPressedPage, NavigatedPage, Page, RootMessage};
@@ -26,7 +26,7 @@ pub struct RepetitionState {
     pub settings: DeckSettings,
     pub set: DeckData,
     current_word: WordData,
-    current_statistic: CardStatistics,
+    current_statistic: CardState,
     open: bool,
     can_play: bool,
     sink: Arc<Option<MixerDeviceSink>>,
diff --git a/src/pages/repetitions.rs b/src/pages/repetitions.rs
index 84c4bc5..38f44d2 100644
--- a/src/pages/repetitions.rs
+++ b/src/pages/repetitions.rs
@@ -1,7 +1,7 @@
 use crate::app::AppState;
 use crate::core::srs::{AppendMode, OrderMode};
 use crate::data::Id;
-use crate::data::entities::{CardStatistics, DeckSettings};
+use crate::data::entities::{CardState, DeckSettings};
 use crate::data_provider::card_states::{add_stat_list, load_stats_of_deck};
 use crate::data_provider::decks::update_deck;
 use crate::navigation::Page::{History, PreviousPage, Repetition, RepetitionSettings};
@@ -585,7 +585,7 @@ impl RepetitionsState {
         let stats = &mut indices
             .map(|i| {
                 let word = &words[i];
-                CardStatistics {
+                CardState {
                     id: 0.into(),
                     word_id: word.id,
                     last_open: Utc::now(),