Rename main folders and write sql backend adaptor

backend/data/Cargo.toml

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+[package]
+name = "data"
+description = "Structs and traits for the data storage and transfer of Crab Fit"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+async-trait = "0.1.68"
+chrono = "0.4.24"

backend/data/src/adaptor.rs

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+use std::error::Error;
+
+use async_trait::async_trait;
+
+use crate::{
+    event::{Event, EventDeletion},
+    person::Person,
+    stats::Stats,
+};
+
+/// Data storage adaptor, all methods on an adaptor can return an error if
+/// something goes wrong, or potentially None if the data requested was not found.
+#[async_trait]
+pub trait Adaptor {
+    /// Creates a new adaptor and performs all setup required
+    ///
+    /// # Panics
+    /// If an error occurs while setting up the adaptor
+    async fn new() -> Self;
+
+    async fn get_stats(&self) -> Result<Stats, Box<dyn Error>>;
+    async fn increment_stat_event_count(&self) -> Result<i32, Box<dyn Error>>;
+    async fn increment_stat_person_count(&self) -> Result<i32, Box<dyn Error>>;
+
+    async fn get_people(&self, event_id: String) -> Result<Option<Vec<Person>>, Box<dyn Error>>;
+    async fn upsert_person(
+        &self,
+        event_id: String,
+        person: Person,
+    ) -> Result<Person, Box<dyn Error>>;
+
+    async fn get_event(&self, id: String) -> Result<Option<Event>, Box<dyn Error>>;
+    async fn create_event(&self, event: Event) -> Result<Event, Box<dyn Error>>;
+
+    /// Delete an event as well as all related people
+    async fn delete_event(&self, id: String) -> Result<EventDeletion, Box<dyn Error>>;
+}

backend/data/src/event.rs

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+use chrono::{DateTime, Utc};
+
+pub struct Event {
+    pub id: String,
+    pub name: String,
+    pub created_at: DateTime<Utc>,
+    pub times: Vec<String>,
+    pub timezone: String,
+}
+
+/// Info about a deleted event
+pub struct EventDeletion {
+    pub id: String,
+    /// The amount of people that were in this event that were also deleted
+    pub person_count: u64,
+}

backend/data/src/lib.rs

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+pub mod adaptor;
+pub mod event;
+pub mod person;
+pub mod stats;

backend/data/src/person.rs

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+use chrono::{DateTime, Utc};
+
+pub struct Person {
+    pub name: String,
+    pub password_hash: Option<String>,
+    pub created_at: DateTime<Utc>,
+    pub availability: Vec<String>,
+}

backend/data/src/stats.rs

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+pub struct Stats {
+    pub event_count: i32,
+    pub person_count: i32,
+}