Mega tables:

mega_menu_locations:

mega_menu_items (first 20):
megamenu_options:
Array
(
)

megamenu_general_settings:
Array
(
)

megamenu_locations:
Array
(
)
Options with mega/menu_location/primary:
  _ep_mega_menu_options = a:1:{s:22:"_ep_mega_menu_settings";a:3:{s:17:"menu_location_512";a:1:{s:19:"ep_megamenu_enabled";i:0;}s:17:"menu_location_526";a:1:{s:19:"ep_megamenu_enabled";i:0;}s:17:"menu_location_423";a:1:{s:19:"ep_megamenu_enabled";s:1:"1";}}}
  megamenu_initial_version = 2.9.5
  megamenu_install_date = 1666006207
  megamenu_multisite_share_themes = false
  megamenu_pro_css_version = 2.5
  megamenu_pro_initial_version = 2.2.4
  megamenu_pro_version = 2.5
  megamenu_settings = [long value, 6119 chars]
  megamenu_themes = [long value, 107292 chars]
  megamenu_themes_last_updated = watercolor_theme
  megamenu_toggle_blocks = [long value, 1641 chars]
  megamenu_version = 3.10.6
  widget_maxmegamenu = a:1:{s:12:"_multiwidget";i:1;}
  widget_maxmegamenu_image_swap = a:1:{s:12:"_multiwidget";i:1;}
  widget_maxmegamenu_reusable_block = a:1:{s:12:"_multiwidget";i:1;}
megamenu_settings keys:
Array
(
    [0] => prefix
    [1] => descriptions
    [2] => second_click
    [3] => primary-menu
    [4] => top-nav-menu
    [5] => top-nav-left-menu
    [6] => footer-menu
    [7] => header-ribbon-menu
    [8] => partner-account-menu
    [9] => user-account-menu
    [10] => primary
)

megamenu_toggle_blocks:
Array
(
    [custom_theme_2] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221, 221, 221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

    [custom_theme_3] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221, 221, 221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

    [default] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221, 221, 221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

    [custom_theme_4] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221, 221, 221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

    [custom_theme_1] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221, 221, 221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

    [custom_theme_6] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221,221,221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

    [watercolor_theme] => Array
        (
            [0] => Array
                (
                    [type] => menu_toggle_animated
                    [align] => right
                    [style] => slider
                    [icon_color] => rgb(221,221,221)
                    [icon_scale] => 0.8
                    [aria_label] => Toggle Menu
                )

        )

)

Theme nav_menu_locations:
Array
(
    [primary-menu] => 526
    [footer-menu] => 53
    [top-nav-menu] => 423
    [header-ribbon-menu] => 285
    [user-account-menu] => 56
    [partner-account-menu] => 286
    [chbs-demo] => 430
    [top-nav-left-menu] => 0
)