proc createColumnString(table: Table; column: Column): string {.
    ...raises: [DbError, KeyError], tags: [], forbids: [].}

proc createCommentColumn(table: Table; column: Column): string {....raises: [],
    tags: [], forbids: [].}

proc createForeignString(table: Table; column: Column): string {.
    ...raises: [KeyError], tags: [], forbids: [].}

proc createIndexString(table: Table; column: Column): string {....raises: [],
    tags: [], forbids: [].}

proc createUpdatedAtString(table: Table; column: Column): seq[string] {.
    ...raises: [], tags: [], forbids: [].}