fix: resolve rowserrcheck lint issues

internal/db/queries.go

@@ -2,6 +2,7 @@ package db
 
 import (
 	"context"
+	"database/sql"
 	"fmt"
 	"time"
 )
@@ -206,12 +207,7 @@ func (s *Database) GetMessagesBefore(
 		limit = 50
 	}
 
-	var rows interface {
-		Next() bool
-		Scan(dest ...any) error
-		Close() error
-		Err() error
-	}
+	var rows *sql.Rows
 
 	var err error
 
@@ -266,12 +262,7 @@ func (s *Database) GetDMsBefore(
 		limit = 50
 	}
 
-	var rows interface {
-		Next() bool
-		Scan(dest ...any) error
-		Close() error
-		Err() error
-	}
+	var rows *sql.Rows
 
 	var err error