introduce queue_db_path to override location as /app/ is not usable on mac

Author: tonyalaribe

.gitignore

@@ -1,3 +1,4 @@
 /target
 /queue_db
-.env
+.env
+users.json

README.md

@@ -4,3 +4,17 @@ A very specialized timeseries database created for events, logs, traces and metr
 
 Its designed to allow users plug in their own s3 storage and buckets and have their stored to their accounts.
 This way, timefusion is used as a compute and cache engine, not primary data storage.
+
+## Configuration
+
+Timefusion can be configured using the following environment variables:
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `PORT` | HTTP server port | `80` |
+| `PGWIRE_PORT` | PostgreSQL wire protocol port | `5432` |
+| `AWS_S3_BUCKET` | AWS S3 bucket name | Required |
+| `AWS_S3_ENDPOINT` | AWS S3 endpoint URL | `https://s3.amazonaws.com` |
+| `QUEUE_DB_PATH` | Path to the persistent queue database | `/app/queue_db` |
+
+For local development, you can set `QUEUE_DB_PATH` to a location in your development environment.

src/main.rs

@@ -289,7 +289,11 @@ async fn main() -> anyhow::Result<()> {
         }
     }
 
-    let queue = match PersistentQueue::new("/app/queue_db") {
+    // Get queue DB path from environment variable or use default
+    let queue_db_path = env::var("QUEUE_DB_PATH").unwrap_or_else(|_| "/app/queue_db".to_string());
+    info!("Using queue DB path: {}", queue_db_path);
+    
+    let queue = match PersistentQueue::new(&queue_db_path) {
         Ok(q) => {
             info!("PersistentQueue initialized successfully");
             Arc::new(q)