Add multiple asset adding route

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/config.rs

@@ -13,7 +13,7 @@ use rust_bert::{
     resources::LocalResource,
 };
 use std::{env, num::NonZeroU32, path::PathBuf, sync::Arc};
-use tokio::sync::Mutex;
+use tokio::sync::{Mutex, Semaphore};
 
 pub const ALPACA_STOCK_DATA_API_URL: &str = "https://data.alpaca.markets/v2/stocks/bars";
 pub const ALPACA_CRYPTO_DATA_API_URL: &str = "https://data.alpaca.markets/v1beta3/crypto/us/bars";
@@ -51,17 +51,21 @@ lazy_static! {
             Mode::Paper => String::from("paper-api"),
         }
     );
-    pub static ref MAX_BERT_INPUTS: usize = env::var("MAX_BERT_INPUTS")
-        .expect("MAX_BERT_INPUTS must be set.")
+    pub static ref BERT_MAX_INPUTS: usize = env::var("BERT_MAX_INPUTS")
+        .expect("BERT_MAX_INPUTS must be set.")
         .parse()
-        .expect("MAX_BERT_INPUTS must be a positive integer.");
-
+        .expect("BERT_MAX_INPUTS must be a positive integer.");
+    pub static ref CLICKHOUSE_MAX_CONNECTIONS: usize = env::var("CLICKHOUSE_MAX_CONNECTIONS")
+        .expect("CLICKHOUSE_MAX_CONNECTIONS must be set.")
+        .parse()
+        .expect("CLICKHOUSE_MAX_CONNECTIONS must be a positive integer.");
 }
 
 pub struct Config {
     pub alpaca_client: Client,
     pub alpaca_rate_limiter: DefaultDirectRateLimiter,
     pub clickhouse_client: clickhouse::Client,
+    pub clickhouse_concurrency_limiter: Arc<Semaphore>,
     pub sequence_classifier: Mutex<SequenceClassificationModel>,
 }
 
@@ -95,6 +99,7 @@ impl Config {
                     env::var("CLICKHOUSE_PASSWORD").expect("CLICKHOUSE_PASSWORD must be set."),
                 )
                 .with_database(env::var("CLICKHOUSE_DB").expect("CLICKHOUSE_DB must be set.")),
+            clickhouse_concurrency_limiter: Arc::new(Semaphore::new(*CLICKHOUSE_MAX_CONNECTIONS)),
             sequence_classifier: Mutex::new(
                 SequenceClassificationModel::new(SequenceClassificationConfig::new(
                     ModelType::Bert,