Refactors workspace

14 files changed, 760 insertions, 0 deletions

diff --git a/rust/schist_models/src/account.rs b/rust/schist_models/src/account.rs
new file mode 100644
index 0000000..43400a3
--- /dev/null
+++ b/rust/schist_models/src/account.rs
@@ -0,0 +1,15 @@
+use diesel::prelude::*;
+use serde::{Deserialize, Serialize};
+
+use crate::datetime_utc::DatetimeUtc;
+
+#[derive(
+    Insertable, Queryable, Identifiable, Selectable, Debug, PartialEq, Clone, Serialize, Deserialize,
+)]
+#[diesel(table_name = crate::schema::accounts)]
+pub struct Account {
+    pub id: i32,
+    pub name: String,
+    pub opening_balance: i32,
+    pub opening_date: DatetimeUtc,
+}
diff --git a/rust/schist_models/src/budget.rs b/rust/schist_models/src/budget.rs
new file mode 100644
index 0000000..03261e5
--- /dev/null
+++ b/rust/schist_models/src/budget.rs
@@ -0,0 +1,43 @@
+use serde::Serialize;
+
+use super::budget_update::BudgetUpdate;
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize)]
+pub struct Budget {
+    pub quantity: i32,
+    pub period: i32,
+}
+
+impl From<&BudgetUpdate> for Budget {
+    fn from(budget_update: &BudgetUpdate) -> Self {
+        Self {
+            quantity: budget_update.new_budget,
+            period: budget_update.new_period,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::date_utc::DateUtc;
+    use schist_traits::nowlike::Nowlike;
+
+    use super::*;
+
+    #[test]
+    fn when_from_budget_update_then_returns_budget() {
+        let quantity = 2;
+        let period = 3;
+        let budget_update = BudgetUpdate {
+            id: 0,
+            category_id: 1,
+            date: DateUtc::now(),
+            new_budget: quantity,
+            new_period: period,
+        };
+
+        let budget = Budget::from(&budget_update);
+
+        assert_eq!(budget, Budget { quantity, period });
+    }
+}
diff --git a/rust/schist_models/src/budget_update.rs b/rust/schist_models/src/budget_update.rs
new file mode 100644
index 0000000..86645cb
--- /dev/null
+++ b/rust/schist_models/src/budget_update.rs
@@ -0,0 +1,16 @@
+use derive_builder::Builder;
+use diesel::prelude::*;
+use serde::Serialize;
+
+use crate::{category::Category, date_utc::DateUtc};
+
+#[derive(Builder, Clone, Serialize, Queryable, Identifiable, Selectable, Associations, Debug, PartialEq, Eq, Insertable)]
+#[diesel(table_name = crate::schema::budget_updates)]
+#[diesel(belongs_to(Category))]
+pub struct BudgetUpdate {
+    pub id: i32,
+    pub category_id: i32,
+    pub date: DateUtc,
+    pub new_budget: i32,
+    pub new_period: i32,
+}
diff --git a/rust/schist_models/src/category.rs b/rust/schist_models/src/category.rs
new file mode 100644
index 0000000..55c7b97
--- /dev/null
+++ b/rust/schist_models/src/category.rs
@@ -0,0 +1,10 @@
+use derive_builder::Builder;
+use diesel::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Builder, Queryable, Identifiable, Selectable, Debug, PartialEq, Serialize, Deserialize, Insertable)]
+#[diesel(table_name = crate::schema::categories)]
+pub struct Category {
+    pub id: i32,
+    pub name: String,
+}
diff --git a/rust/schist_models/src/category_balance.rs b/rust/schist_models/src/category_balance.rs
new file mode 100644
index 0000000..796b40b
--- /dev/null
+++ b/rust/schist_models/src/category_balance.rs
@@ -0,0 +1,7 @@
+use serde::Serialize;
+
+#[derive(Serialize)]
+pub struct CategoryBalance {
+    pub category_id: i32,
+    pub balance: i32,
+}
diff --git a/rust/schist_models/src/category_budget.rs b/rust/schist_models/src/category_budget.rs
new file mode 100644
index 0000000..9796261
--- /dev/null
+++ b/rust/schist_models/src/category_budget.rs
@@ -0,0 +1,9 @@
+use serde::Serialize;
+
+use super::budget::Budget;
+
+#[derive(Serialize)]
+pub struct CategoryBudget {
+    pub category_id: i32,
+    pub budget: Option<Budget>,
+}
diff --git a/rust/schist_models/src/category_transfer.rs b/rust/schist_models/src/category_transfer.rs
new file mode 100644
index 0000000..7b36054
--- /dev/null
+++ b/rust/schist_models/src/category_transfer.rs
@@ -0,0 +1,12 @@
+use derive_builder::Builder;
+use diesel::prelude::*;
+
+#[derive(Builder, Queryable, Identifiable, Selectable, Debug, PartialEq, Insertable)]
+#[diesel(table_name = crate::schema::category_transfers)]
+pub struct CategoryTransfer {
+    pub id: i32,
+    pub description: String,
+    pub quantity: i32,
+    pub from_category_id: i32,
+    pub to_category_id: i32,
+}
diff --git a/rust/schist_models/src/date_utc.rs b/rust/schist_models/src/date_utc.rs
new file mode 100644
index 0000000..3f5391c
--- /dev/null
+++ b/rust/schist_models/src/date_utc.rs
@@ -0,0 +1,309 @@
+use std::{borrow::Borrow, fmt, str::FromStr};
+
+use anyhow::{Context, Error, Result};
+use chrono::{DateTime, Datelike, NaiveDate, NaiveTime, Utc};
+use diesel::{
+    backend::Backend,
+    deserialize::{self, FromSql, FromSqlRow},
+    expression::AsExpression,
+    serialize::{self, ToSql},
+    sql_types::Text,
+    sqlite::Sqlite,
+};
+use serde::{Deserialize, Serialize};
+
+use schist_traits::{dateable::Dateable, nowlike::Nowlike};
+
+use crate::datetime_utc::DatetimeUtc;
+
+#[derive(
+    Eq,
+    PartialEq,
+    Ord,
+    PartialOrd,
+    Serialize,
+    Deserialize,
+    Clone,
+    Debug,
+    AsExpression,
+    FromSqlRow,
+)]
+#[diesel(sql_type=Text)]
+pub struct DateUtc {
+    chrono_datetime_utc: DateTime<Utc>,
+}
+
+impl DateUtc {
+    pub fn from_ymd(year: i32, month: u32, day: u32) -> Result<Self> {
+        Ok(Self {
+            chrono_datetime_utc: NaiveDate::from_ymd_opt(year, month, day)
+                .with_context(|| format!("failed to construct date from ymd {:04}-{:02}-{:02}", year, month, day))?
+                .and_hms_opt(0, 0, 0).unwrap()
+                .and_utc()
+        })
+    }
+
+    pub fn with_hms(&mut self, hour: u32, min: u32, sec: u32) -> Result<DatetimeUtc> {
+        DatetimeUtc::from_ymd_and_hms(
+            self.year(), self.month(), self.day(), hour, min, sec,
+        )
+    }
+
+    pub fn day_diff(&self, other: &DateUtc) -> u32 {
+        self.chrono_datetime_utc
+            .num_days_from_ce()
+            .abs_diff(other.chrono_datetime_utc.num_days_from_ce())
+    }
+
+    fn is_day_str(str: &str) -> bool {
+        if str.len() != 10 {
+            return false;
+        }
+        for (ix, ch) in str.chars().enumerate() {
+            if ix == 4 || ix == 7 {
+                if ch != '-' {
+                    return false;
+                }
+            } else {
+                if ch < '0' || ch > '9' {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+}
+
+impl Nowlike for DateUtc {
+    fn now() -> Self {
+        let now = Utc::now();
+        Self::from_ymd(
+            now.year(),
+            now.month(),
+            now.day(),
+        ).unwrap()
+    }
+}
+
+impl Dateable for DateUtc {
+    fn year(&self) -> i32 {
+        self.chrono_datetime_utc.year()
+    }
+
+    fn month(&self) -> u32 {
+        self.chrono_datetime_utc.month()
+    }
+
+    fn day(&self) -> u32 {
+        self.chrono_datetime_utc.day()
+    }
+}
+
+impl From<DatetimeUtc> for DateUtc {
+    fn from(datetime_utc: DatetimeUtc) -> Self {
+        Self {
+            chrono_datetime_utc: datetime_utc
+                .borrow()
+                .to_string()
+                .parse::<DateTime<Utc>>().unwrap()
+                .with_time(NaiveTime::from_hms_opt(0, 0, 0).unwrap()).unwrap(),
+        }
+    }
+}
+
+impl<T> From<T> for DateUtc where T: Borrow<DateTime<Utc>> {
+    fn from(chrono_datetime_utc: T) -> Self {
+        Self {
+            chrono_datetime_utc: chrono_datetime_utc
+                .borrow()
+                .with_time(NaiveTime::from_hms_opt(0, 0, 0).unwrap()).unwrap(),
+        }
+    }
+}
+
+impl fmt::Display for DateUtc {
+    /// Converts to a day string, YYYY-MM-DD, in UTC
+    /// Example: 10.30am 24 Oct 2024 UTC -> "2024-10-24"
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        let date_str = self.chrono_datetime_utc.to_rfc3339();
+        let day_str = date_str
+            .split_at_checked(10)
+            .unwrap()
+            .0;
+        write!(f, "{}", day_str)
+    }
+}
+
+impl FromStr for DateUtc {
+    type Err = anyhow::Error;
+
+    /// Constructs DatetimeUtc from a day string, YYYY-MM-DD, in UTC
+    /// Example: "2024-10-24" -> Midnight 24 Oct 2024 UTC
+    fn from_str(date_str: &str) -> Result<Self> {
+        if !Self::is_day_str(&date_str) {
+            Err(Error::msg(format!("{} is not a day string in YYYY-MM-DD format", date_str)))
+        } else {
+            let mut datetime_str = String::from(date_str);
+            datetime_str.push_str("T00:00:00.000Z");
+            Ok(Self {
+                chrono_datetime_utc: datetime_str.parse()?,
+            })
+        }
+    }
+}
+
+impl ToSql<Text, Sqlite> for DateUtc {
+    fn to_sql<'b>(
+        &'b self,
+        out: &mut diesel::serialize::Output<'b, '_, Sqlite>,
+    ) -> serialize::Result {
+        out.set_value(self.to_string());
+        Ok(serialize::IsNull::No)
+    }
+}
+
+impl FromSql<Text, Sqlite> for DateUtc {
+    fn from_sql(bytes: <Sqlite as Backend>::RawValue<'_>) -> deserialize::Result<DateUtc> {
+        let str = <String as FromSql<Text, Sqlite>>::from_sql(bytes)?;
+        Ok(str.parse()?)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use schist_traits::timeable::Timeable;
+
+    use super::*;
+
+    #[test]
+    fn when_from_ymd_then_ymd_are_as_expected() {
+        let date_utc = DateUtc::from_ymd(1970, 11, 23);
+
+        assert!(date_utc.is_ok());
+        let date_utc = date_utc.unwrap();
+        assert_eq!(date_utc.year(), 1970);
+        assert_eq!(date_utc.month(), 11);
+        assert_eq!(date_utc.day(), 23);
+    }
+
+    #[test]
+    fn when_from_ymd_then_to_string_as_expected() {
+        let date_utc = DateUtc::from_ymd(1970, 11, 23);
+
+        assert!(date_utc.is_ok());
+        assert_eq!(date_utc.unwrap().to_string(), "1970-11-23");
+    }
+
+    #[test]
+    fn when_from_invalid_ymd_then_err() {
+        let date_utc_1 = DateUtc::from_ymd(1970, 0, 23);
+        let date_utc_2 = DateUtc::from_ymd(1970, 13, 23);
+        let date_utc_3 = DateUtc::from_ymd(1970, 11, 0);
+        let date_utc_4 = DateUtc::from_ymd(1970, 11, 31);
+        let date_utc_5 = DateUtc::from_ymd(1971, 2, 29);
+
+        assert!(date_utc_1.is_err());
+        assert_eq!(date_utc_1.unwrap_err().to_string(), "failed to construct date from ymd 1970-00-23");
+        assert!(date_utc_2.is_err());
+        assert_eq!(date_utc_2.unwrap_err().to_string(), "failed to construct date from ymd 1970-13-23");
+        assert!(date_utc_3.is_err());
+        assert_eq!(date_utc_3.unwrap_err().to_string(), "failed to construct date from ymd 1970-11-00");
+        assert!(date_utc_4.is_err());
+        assert_eq!(date_utc_4.unwrap_err().to_string(), "failed to construct date from ymd 1970-11-31");
+        assert!(date_utc_5.is_err());
+        assert_eq!(date_utc_5.unwrap_err().to_string(), "failed to construct date from ymd 1971-02-29");
+    }
+
+    #[test]
+    fn when_from_string_then_ymd_are_as_expected() {
+        let date_utc: Result<DateUtc> = "1970-11-23".parse();
+
+        assert!(date_utc.is_ok());
+        let date_utc = date_utc.unwrap();
+        assert_eq!(date_utc.year(), 1970);
+        assert_eq!(date_utc.month(), 11);
+        assert_eq!(date_utc.day(), 23);
+    }
+
+    #[test]
+    fn when_from_string_then_to_string_as_expected() {
+        let date_utc: Result<DateUtc> = "1970-11-23".parse();
+
+        assert!(date_utc.is_ok());
+        assert_eq!(date_utc.unwrap().to_string(), "1970-11-23");
+    }
+
+    #[test]
+    fn when_from_invalid_string_then_err() {
+        let date_utc_1: Result<DateUtc> = "1970-00-23".parse();
+        let date_utc_2: Result<DateUtc> = "1970-13-23".parse();
+        let date_utc_3: Result<DateUtc> = "1970-11-0".parse();
+        let date_utc_4: Result<DateUtc> = "1970-11-31".parse();
+        let date_utc_5: Result<DateUtc> = "1971-02-29".parse();
+
+        assert!(date_utc_1.is_err());
+        assert!(date_utc_2.is_err());
+        assert!(date_utc_3.is_err());
+        assert!(date_utc_4.is_err());
+        assert!(date_utc_5.is_err());
+    }
+
+    #[test]
+    fn with_with_hms_then_ymd_hms_are_as_expected() {
+        let datetime_utc = DateUtc::from_ymd(1970, 11, 23).unwrap().with_hms(12, 55, 16);
+
+        assert!(datetime_utc.is_ok());
+        let datetime_utc = datetime_utc.unwrap();
+        assert_eq!(datetime_utc.year(), 1970);
+        assert_eq!(datetime_utc.month(), 11);
+        assert_eq!(datetime_utc.day(), 23);
+        assert_eq!(datetime_utc.hour(), 12);
+        assert_eq!(datetime_utc.minute(), 55);
+        assert_eq!(datetime_utc.second(), 16);
+    }
+
+    #[test]
+    fn when_with_invalid_hms_then_err() {
+        let datetime_utc_1 = DateUtc::from_ymd(1970, 11, 23).unwrap().with_hms(25, 0, 0);
+        let datetime_utc_2 = DateUtc::from_ymd(1970, 11, 23).unwrap().with_hms(0, 61, 0);
+        let datetime_utc_3 = DateUtc::from_ymd(1970, 11, 23).unwrap().with_hms(0, 0, 61);
+
+        assert!(datetime_utc_1.is_err());
+        assert!(datetime_utc_2.is_err());
+        assert!(datetime_utc_3.is_err());
+    }
+
+    #[test]
+    fn when_from_datetime_utc_at_different_times_on_same_day_then_eq() {
+        let datetime_utc1 = DateUtc::from_ymd(1970, 11, 23).unwrap().with_hms(0, 0, 0).unwrap();
+        let datetime_utc2 = DateUtc::from_ymd(1970, 11, 23).unwrap().with_hms(23, 59, 59).unwrap();
+        let date_utc1 = DateUtc::from(datetime_utc1);
+        let date_utc2 = DateUtc::from(datetime_utc2);
+
+        assert_eq!(date_utc1, date_utc2);
+    }
+
+    #[test]
+    fn given_today_when_day_diff_today_then_return_0() {
+        let start = DateUtc::from_ymd(2000, 1, 1).unwrap();
+        let end = DateUtc::from_ymd(2000, 1, 1).unwrap();
+
+        let day_diff = start.day_diff(&end);
+        let neg_day_diff = end.day_diff(&start);
+
+        assert_eq!(day_diff, 0);
+        assert_eq!(day_diff, neg_day_diff);
+    }
+
+    #[test]
+    fn given_today_when_day_diff_tomorrow_then_return_1() {
+        let start = DateUtc::from_ymd(2000, 1, 1).unwrap();
+        let end = DateUtc::from_ymd(2000, 1, 2).unwrap();
+
+        let day_diff = start.day_diff(&end);
+        let neg_day_diff = end.day_diff(&start);
+
+        assert_eq!(day_diff, 1);
+        assert_eq!(day_diff, neg_day_diff);
+    }
+}
diff --git a/rust/schist_models/src/datetime_utc.rs b/rust/schist_models/src/datetime_utc.rs
new file mode 100644
index 0000000..9b63145
--- /dev/null
+++ b/rust/schist_models/src/datetime_utc.rs
@@ -0,0 +1,223 @@
+use std::{fmt::Display, str::FromStr};
+
+use anyhow::{Context, Result};
+use chrono::{DateTime, Datelike as ChronoDatelike, NaiveDate, Timelike as ChronoTimelike, Utc};
+use diesel::{
+    backend::Backend,
+    deserialize::{self, FromSql, FromSqlRow},
+    expression::AsExpression,
+    serialize::{self, ToSql},
+    sql_types::Text,
+    sqlite::Sqlite,
+};
+use serde::{Deserialize, Serialize};
+
+use schist_traits::{dateable::Dateable, nowlike::Nowlike, timeable::Timeable};
+
+#[derive(
+    PartialEq,
+    Eq,
+    PartialOrd,
+    Ord,
+    Serialize,
+    Deserialize,
+    Clone,
+    Debug,
+    AsExpression,
+    FromSqlRow,
+)]
+#[diesel(sql_type=Text)]
+pub struct DatetimeUtc {
+    chrono_datetime_utc: DateTime<Utc>,
+}
+
+impl DatetimeUtc {
+    pub fn from_ymd_and_hms(year: i32, month: u32, day: u32, hour: u32, min: u32, sec: u32) -> Result<Self> {
+        Ok(Self { chrono_datetime_utc: NaiveDate
+            ::from_ymd_opt(year, month, day)
+            .with_context(|| format!("failed to construct datetime from ymd {:04}-{:02}-{:02}", year, month, day))?
+            .and_hms_opt(hour, min, sec)
+            .with_context(|| format!("failed to construct datetime from hms {:02}:{:02}:{:02}", hour, min, sec))?
+            .and_utc()
+        })
+    }
+}
+
+impl FromStr for DatetimeUtc {
+    type Err = anyhow::Error;
+
+    /// Constructs DatetimeUtc from a date string in ISO format, in UTC
+    /// Example: "2024-10-24T10:30:00.000" -> 10.30am 24 Oct 2024 UTC
+    fn from_str(datetime_str: &str) -> Result<Self> {
+        let chrono_datetime_utc = datetime_str.parse::<DateTime<Utc>>()?;
+        Ok(Self {
+            chrono_datetime_utc,
+        })
+    }
+}
+
+impl Display for DatetimeUtc {
+    /// Converts to a date string in ISO format, in UTC
+    /// Example: 10.30am 24 Oct 2024 UTC -> "2024-10-24T10:30:00.000Z"
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{}", self.chrono_datetime_utc.to_rfc3339_opts(chrono::SecondsFormat::Millis, true))
+    }
+}
+
+impl Nowlike for DatetimeUtc {
+    fn now() -> Self {
+        let now = Utc::now();
+        Self::from_ymd_and_hms(
+            now.year(),
+            now.month(),
+            now.day(),
+            now.hour(),
+            now.minute(),
+            now.second(),
+        ).unwrap()
+    }
+}
+
+impl Dateable for DatetimeUtc {
+    fn year(&self) -> i32 {
+        self.chrono_datetime_utc.year()
+    }
+
+    fn month(&self) -> u32 {
+        self.chrono_datetime_utc.month()
+    }
+
+    fn day(&self) -> u32 {
+        self.chrono_datetime_utc.day()
+    }
+}
+
+impl Timeable for DatetimeUtc {
+    fn hour(&self) -> u32 {
+        self.chrono_datetime_utc.hour()
+    }
+
+    fn minute(&self) -> u32 {
+        self.chrono_datetime_utc.minute()
+    }
+
+    fn second(&self) -> u32 {
+        self.chrono_datetime_utc.second()
+    }
+}
+
+impl ToSql<Text, Sqlite> for DatetimeUtc {
+    fn to_sql<'b>(
+        &'b self,
+        out: &mut diesel::serialize::Output<'b, '_, Sqlite>,
+    ) -> serialize::Result {
+        out.set_value::<String>(self.to_string());
+        Ok(serialize::IsNull::No)
+    }
+}
+
+impl FromSql<Text, Sqlite> for DatetimeUtc {
+    fn from_sql(bytes: <Sqlite as Backend>::RawValue<'_>) -> deserialize::Result<DatetimeUtc> {
+        let str = <String as FromSql<Text, Sqlite>>::from_sql(bytes)?;
+        Ok(str.parse()?)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn when_from_ymd_and_hms_then_ymd_and_hms_are_as_expected() {
+        let datetime_utc = DatetimeUtc::from_ymd_and_hms(1970, 11, 23, 12, 55, 16);
+
+        assert!(datetime_utc.is_ok());
+        let date_utc = datetime_utc.unwrap();
+        assert_eq!(date_utc.year(), 1970);
+        assert_eq!(date_utc.month(), 11);
+        assert_eq!(date_utc.day(), 23);
+        assert_eq!(date_utc.hour(), 12);
+        assert_eq!(date_utc.minute(), 55);
+        assert_eq!(date_utc.second(), 16);
+    }
+
+    #[test]
+    fn when_from_ymd_and_hms_then_to_string_as_expected() {
+        let date_utc = DatetimeUtc::from_ymd_and_hms(1970, 11, 23, 12, 55, 16);
+
+        assert!(date_utc.is_ok());
+        assert_eq!(date_utc.unwrap().to_string(), "1970-11-23T12:55:16.000Z")
+    }
+
+    #[test]
+    fn when_with_invalid_ymd_and_hms_then_err() {
+        let datetime_utc_1 = DatetimeUtc::from_ymd_and_hms(1970, 0, 23, 12, 55, 16);
+        let datetime_utc_2 = DatetimeUtc::from_ymd_and_hms(1970, 13, 23, 12, 55, 16);
+        let datetime_utc_3 = DatetimeUtc::from_ymd_and_hms(1970, 11, 0, 12, 55, 16);
+        let datetime_utc_4 = DatetimeUtc::from_ymd_and_hms(1970, 11, 31, 12, 55, 16);
+        let datetime_utc_5 = DatetimeUtc::from_ymd_and_hms(1971, 2, 29, 12, 55, 16);
+        let datetime_utc_6 = DatetimeUtc::from_ymd_and_hms(1970, 11, 23, 25, 0, 0);
+        let datetime_utc_7 = DatetimeUtc::from_ymd_and_hms(1970, 11, 23, 0, 61, 0);
+        let datetime_utc_8 = DatetimeUtc::from_ymd_and_hms(1970, 11, 23, 0, 0, 61);
+
+        assert!(datetime_utc_1.is_err());
+        assert_eq!(datetime_utc_1.unwrap_err().to_string(), "failed to construct datetime from ymd 1970-00-23");
+        assert!(datetime_utc_2.is_err());
+        assert_eq!(datetime_utc_2.unwrap_err().to_string(), "failed to construct datetime from ymd 1970-13-23");
+        assert!(datetime_utc_3.is_err());
+        assert_eq!(datetime_utc_3.unwrap_err().to_string(), "failed to construct datetime from ymd 1970-11-00");
+        assert!(datetime_utc_4.is_err());
+        assert_eq!(datetime_utc_4.unwrap_err().to_string(), "failed to construct datetime from ymd 1970-11-31");
+        assert!(datetime_utc_5.is_err());
+        assert_eq!(datetime_utc_5.unwrap_err().to_string(), "failed to construct datetime from ymd 1971-02-29");
+        assert!(datetime_utc_6.is_err());
+        assert_eq!(datetime_utc_6.unwrap_err().to_string(), "failed to construct datetime from hms 25:00:00");
+        assert!(datetime_utc_7.is_err());
+        assert_eq!(datetime_utc_7.unwrap_err().to_string(), "failed to construct datetime from hms 00:61:00");
+        assert!(datetime_utc_8.is_err());
+        assert_eq!(datetime_utc_8.unwrap_err().to_string(), "failed to construct datetime from hms 00:00:61");
+    }
+
+    #[test]
+    fn when_from_string_then_ymd_and_hms_are_as_expected() {
+        let date_utc: Result<DatetimeUtc> = "1970-11-23T12:55:16.000Z".parse();
+
+        assert!(date_utc.is_ok());
+        let datetime_utc = date_utc.unwrap();
+        assert_eq!(datetime_utc.year(), 1970);
+        assert_eq!(datetime_utc.month(), 11);
+        assert_eq!(datetime_utc.day(), 23);
+        assert_eq!(datetime_utc.hour(), 12);
+        assert_eq!(datetime_utc.minute(), 55);
+        assert_eq!(datetime_utc.second(), 16);
+    }
+
+    #[test]
+    fn when_from_string_then_to_string_as_expected() {
+        let datetime_utc: Result<DatetimeUtc> = "1970-11-23T12:55:16.000Z".parse();
+
+        assert!(datetime_utc.is_ok());
+        assert_eq!(datetime_utc.unwrap().to_string(), "1970-11-23T12:55:16.000Z")
+    }
+
+    #[test]
+    fn when_from_invalid_string_then_err() {
+        let datetime_utc_1: Result<DatetimeUtc> = "1970-00-23T00:00:00.000Z".parse();
+        let datetime_utc_2: Result<DatetimeUtc> = "1970-13-23T00:00:00.000Z".parse();
+        let datetime_utc_3: Result<DatetimeUtc> = "1970-11-0T00:00:00.000Z".parse();
+        let datetime_utc_4: Result<DatetimeUtc> = "1970-11-31T00:00:00.000Z".parse();
+        let datetime_utc_5: Result<DatetimeUtc> = "1971-02-29T00:00:00.000Z".parse();
+        let datetime_utc_6: Result<DatetimeUtc> = "1970-11-23T25:00:00.000Z".parse();
+        let datetime_utc_7: Result<DatetimeUtc> = "1970-11-23T00:61:00.000Z".parse();
+        let datetime_utc_8: Result<DatetimeUtc> = "1970-11-23T00:00:61.000Z".parse();
+
+        assert!(datetime_utc_1.is_err());
+        assert!(datetime_utc_2.is_err());
+        assert!(datetime_utc_3.is_err());
+        assert!(datetime_utc_4.is_err());
+        assert!(datetime_utc_5.is_err());
+        assert!(datetime_utc_6.is_err());
+        assert!(datetime_utc_7.is_err());
+        assert!(datetime_utc_8.is_err());
+    }
+}
diff --git a/rust/schist_models/src/lib.rs b/rust/schist_models/src/lib.rs
new file mode 100644
index 0000000..9e60e80
--- /dev/null
+++ b/rust/schist_models/src/lib.rs
@@ -0,0 +1,13 @@
+pub mod account;
+pub mod budget;
+pub mod budget_update;
+pub mod category;
+pub mod category_balance;
+pub mod category_budget;
+pub mod category_transfer;
+pub mod date_utc;
+pub mod datetime_utc;
+pub mod migrations;
+pub mod transaction;
+pub mod transaction_categorisation;
+pub mod schema;
diff --git a/rust/schist_models/src/migrations.rs b/rust/schist_models/src/migrations.rs
new file mode 100644
index 0000000..d10cb83
--- /dev/null
+++ b/rust/schist_models/src/migrations.rs
@@ -0,0 +1,3 @@
+use diesel_migrations::{embed_migrations, EmbeddedMigrations};
+
+pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!("migrations");
diff --git a/rust/schist_models/src/schema.rs b/rust/schist_models/src/schema.rs
new file mode 100644
index 0000000..372f8f3
--- /dev/null
+++ b/rust/schist_models/src/schema.rs
@@ -0,0 +1,72 @@
+// @generated automatically by Diesel CLI.
+
+diesel::table! {
+    accounts (id) {
+        id -> Integer,
+        name -> Text,
+        opening_balance -> Integer,
+        opening_date -> Text,
+    }
+}
+
+diesel::table! {
+    budget_updates (id) {
+        id -> Integer,
+        category_id -> Integer,
+        date -> Text,
+        new_budget -> Integer,
+        new_period -> Integer,
+    }
+}
+
+diesel::table! {
+    categories (id) {
+        id -> Integer,
+        name -> Text,
+    }
+}
+
+diesel::table! {
+    category_transfers (id) {
+        id -> Integer,
+        description -> Text,
+        quantity -> Integer,
+        from_category_id -> Integer,
+        to_category_id -> Integer,
+    }
+}
+
+diesel::table! {
+    transaction_categorisations (id) {
+        id -> Integer,
+        description -> Text,
+        quantity -> Integer,
+        transaction_id -> Integer,
+        category_id -> Integer,
+    }
+}
+
+diesel::table! {
+    transactions (id) {
+        id -> Integer,
+        description -> Text,
+        payee -> Text,
+        quantity -> Integer,
+        date -> Text,
+        account_id -> Integer,
+    }
+}
+
+diesel::joinable!(budget_updates -> categories (category_id));
+diesel::joinable!(transaction_categorisations -> categories (category_id));
+diesel::joinable!(transaction_categorisations -> transactions (transaction_id));
+diesel::joinable!(transactions -> accounts (account_id));
+
+diesel::allow_tables_to_appear_in_same_query!(
+    accounts,
+    budget_updates,
+    categories,
+    category_transfers,
+    transaction_categorisations,
+    transactions,
+);
diff --git a/rust/schist_models/src/transaction.rs b/rust/schist_models/src/transaction.rs
new file mode 100644
index 0000000..eb9e816
--- /dev/null
+++ b/rust/schist_models/src/transaction.rs
@@ -0,0 +1,16 @@
+use derive_builder::Builder;
+use diesel::prelude::*;
+
+use crate::{account::Account, datetime_utc::DatetimeUtc};
+
+#[derive(Builder, Queryable, Identifiable, Selectable, Insertable, Associations, Debug, PartialEq)]
+#[diesel(table_name = crate::schema::transactions)]
+#[diesel(belongs_to(Account))]
+pub struct Transaction {
+    pub id: i32,
+    pub description: String,
+    pub payee: String,
+    pub quantity: i32,
+    pub date: DatetimeUtc,
+    pub account_id: i32,
+}
diff --git a/rust/schist_models/src/transaction_categorisation.rs b/rust/schist_models/src/transaction_categorisation.rs
new file mode 100644
index 0000000..c6ac6ea
--- /dev/null
+++ b/rust/schist_models/src/transaction_categorisation.rs
@@ -0,0 +1,12 @@
+use derive_builder::Builder;
+use diesel::prelude::*;
+
+#[derive(Builder, Queryable, Identifiable, Selectable, Insertable, Debug, PartialEq)]
+#[diesel(table_name = crate::schema::transaction_categorisations)]
+pub struct TransactionCategorisation {
+    pub id: i32,
+    pub description: String,
+    pub quantity: i32,
+    pub transaction_id: i32,
+    pub category_id: i32,
+}