fix: do not run auto_vacuum on read-only connections

src/db.rs

@@ -364,6 +364,9 @@ pub async fn db_writer(
 
 /// Persist an event to the database, returning rows added.
 pub fn write_event(conn: &mut PooledConnection, e: &Event) -> Result<usize> {
+    // enable auto vacuum
+    conn.execute_batch("pragma auto_vacuum = FULL")?;
+
     // start transaction
     let tx = conn.transaction()?;
     // get relevant fields from event and convert to blobs.

src/schema.rs

@@ -14,7 +14,6 @@ use tracing::{debug, error, info};
 /// Startup DB Pragmas
 pub const STARTUP_SQL: &str = r##"
 PRAGMA main.synchronous = NORMAL;
-PRAGMA auto_vacuum = FULL;
 PRAGMA foreign_keys = ON;
 PRAGMA journal_size_limit = 32768;
 pragma mmap_size = 17179869184; -- cap mmap at 16GB