fix: Major ML compilation improvements - reduced errors from 133 to 12

- Fixed all import issues across ML modules
- Corrected type imports from common crate
- Fixed MarketData/MarketDataSnapshot type mismatch
- Resolved namespace conflicts in ML lib.rs
- Fixed imports in features, inference, training, risk modules
- Updated common/mod.rs to use correct crate imports

STATUS: Only ML crate fails compilation (12 errors)
- 6 duplicate import errors from common modules
- 5 type mismatch/casting errors to resolve
- All other workspace crates compile successfully

This represents 91% reduction in ML errors (133→12)

database/Cargo.toml

@@ -15,7 +15,7 @@ description = "Database schemas and utilities for Foxhunt HFT Trading System"
 
 [dependencies]
 # Database dependencies
-sqlx = { workspace = true }
+sqlx = { workspace = true, features = ["migrate"] }
 tokio = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }

database/src/lib.rs

@@ -61,8 +61,10 @@ use crate::transaction::DatabaseTransaction;
 // serde imports removed - not needed
 use sqlx::postgres::PgRow;
 use sqlx::FromRow;
+use sqlx::migrate::Migrator;
 use std::future::Future;
 use std::time::Duration;
+use std::path::Path;
 use tracing::{debug, info};
 
 // Re-export commonly used types
@@ -333,7 +335,13 @@ impl Database {
     pub async fn migrate(&self) -> DatabaseResult<()> {
         info!("Running database migrations");
 
-        sqlx::migrate!("./migrations")
+        let migrator = Migrator::new(Path::new("./migrations"))
+            .await
+            .map_err(|e| DatabaseError::Migration {
+                message: format!("Migration setup failed: {}", e),
+            })?;
+        
+        migrator
             .run(self.pool.inner())
             .await
             .map_err(|e| DatabaseError::Migration {