[refactor] removed analytics, config, and modular crates to simplify the codebase and streamline architecture

backend-rust/crates/db/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "db"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = { workspace = true }
+sqlx = { workspace = true, features = ["sqlite"] }
+tracing = { workspace = true }
+api = { path = "../api" }

backend-rust/crates/db/src/lib.rs

@@ -0,0 +1,44 @@
+use api::config::AppSettings;
+use anyhow::{Context, Result};
+use sqlx::migrate::Migrator;
+use sqlx::sqlite::{SqliteConnectOptions, SqlitePoolOptions};
+use sqlx::{Pool, Sqlite, SqlitePool};
+use std::str::FromStr;
+use std::time::Duration;
+use tracing::info;
+
+// Embed migrations from the workspace-level migrations directory.
+// crates/db is two levels below backend-rust where migrations/ resides.
+pub const MIGRATOR: Migrator = sqlx::migrate!("../../migrations");
+
+pub async fn initialize_db(app_settings: &AppSettings) -> Result<Pool<Sqlite>> {
+    app_settings
+        .ensure_default_directory()
+        .context("Failed to ensure default directory for database")?;
+
+    let options = SqliteConnectOptions::from_str(&app_settings.database_url())?
+        .create_if_missing(true)
+        .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal)
+        .foreign_keys(true);
+
+    let pool = SqlitePoolOptions::new()
+        .max_connections(20)
+        .min_connections(5)
+        .acquire_timeout(Duration::from_secs(30))
+        .idle_timeout(Duration::from_secs(600))
+        .connect_with(options)
+        .await?;
+
+    MIGRATOR
+        .run(&pool)
+        .await
+        .with_context(|| "Database migrations failed")?;
+    info!("Database migrations completed successfully");
+
+    Ok(pool)
+}
+
+pub async fn create_pool(opts: SqliteConnectOptions) -> Result<SqlitePool> {
+    let pool = SqlitePool::connect_with(opts).await?;
+    Ok(pool)
+}