Fix compile errors

backend/src/db.rs

@@ -1,15 +1,48 @@
-use anyhow::Result;
-use sqlx::{migrate::Migrator, sqlite::SqlitePoolOptions, SqlitePool};
+use anyhow::{anyhow, Result};
+use sqlx::{migrate::Migrator, sqlite::SqliteConnectOptions, sqlite::SqlitePoolOptions, SqlitePool};
+use std::str::FromStr;
+use std::fs;
+use std::path::Path;
 
 static MIGRATOR: Migrator = sqlx::migrate!("./migrations");
 
 pub async fn init_pool(database_url: &str) -> Result<SqlitePool> {
+    ensure_sqlite_directory(database_url)?;
+    let options = SqliteConnectOptions::from_str(database_url)?.create_if_missing(true);
     let pool = SqlitePoolOptions::new()
         .max_connections(5)
-        .connect(database_url)
+        .connect_with(options)
+        .await?;
+
+    sqlx::query("PRAGMA journal_mode = WAL;")
+        .execute(&pool)
         .await?;
 
     MIGRATOR.run(&pool).await?;
 
     Ok(pool)
 }
+
+fn ensure_sqlite_directory(database_url: &str) -> Result<()> {
+    const PREFIX: &str = "sqlite://";
+    if !database_url.starts_with(PREFIX) {
+        return Ok(());
+    }
+
+    let path = &database_url[PREFIX.len()..];
+    if path.is_empty() || path == ":memory:" {
+        return Ok(());
+    }
+
+    let path = if let Some(stripped) = path.strip_prefix('/') {
+        format!("/{}", stripped)
+    } else {
+        path.to_string()
+    };
+
+    let parent = Path::new(&path)
+        .parent()
+        .ok_or_else(|| anyhow!("invalid sqlite path"))?;
+    fs::create_dir_all(parent)?;
+    Ok(())
+}