adding position and trade endpoints

internal/database/main.go

@@ -30,6 +30,7 @@ func InitDB(db *sql.DB) {
     CREATE TABLE IF NOT EXISTS position (
         id         INTEGER PRIMARY KEY AUTOINCREMENT,
         company_id INTEGER NOT NULL,
+        currency_id INTEGER NOT NULL,
         shares     INTEGER NOT NULL,
         weight     REAL NOT NULL,
         CostBases   REAL NOT NULL,