DB-Structure
For database management we've include a current version of adminer.php in /admin/adminer.php.
The documentation can be found here: https://www.adminer.org/
This is the schema of the current database:

This is a dump of the structure of the sql-tables:
CREATE TABLE `groups` (
`id` int NOT NULL,
`hidden` int NOT NULL DEFAULT '0',
`deleted` int NOT NULL DEFAULT '0',
`name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`tags` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`position_via` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`position_file` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`position_x` int NOT NULL DEFAULT '0',
`position_y` int NOT NULL DEFAULT '0',
`rotation` int NOT NULL DEFAULT '0',
`collision_area` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`collision_area_x` int NOT NULL DEFAULT '0',
`collision_area_y` int NOT NULL DEFAULT '0',
`collision_area_radius` int NOT NULL DEFAULT '0',
`collision_area_width` int NOT NULL DEFAULT '0',
`collision_area_height` int NOT NULL DEFAULT '0',
`shadow_texture` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`shadow_area_x` int NOT NULL DEFAULT '0',
`shadow_area_width` int NOT NULL DEFAULT '0',
`shadow_area_height` int NOT NULL DEFAULT '0',
`shadow_area_y` int NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE `infos` (
`id` int NOT NULL,
`type` varchar(50) CHARACTER SET utf8mb3 COLLATE utf8mb3_bin NOT NULL,
`text` text CHARACTER SET utf8mb3 COLLATE utf8mb3_bin NOT NULL,
`position` int NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8mb3_bin;
CREATE TABLE `layers` (
`id` int NOT NULL,
`deleted` int NOT NULL DEFAULT '0',
`object_id` int NOT NULL,
`name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`author` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`title` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`year` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`material` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`dimensions` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`lender` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`description` mediumtext CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE `media` (
`id` int NOT NULL,
`layer_id` int NOT NULL,
`type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
`file` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
`vimeo_id` int NOT NULL,
`description` mediumtext CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE `objects` (
`id` int NOT NULL,
`deleted` int NOT NULL DEFAULT '0',
`group_id` int NOT NULL,
`file_3D` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
`file_highres_3D` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
`position_x` int DEFAULT '0',
`position_y` int NOT NULL DEFAULT '0',
`rotation` int NOT NULL DEFAULT '0',
`interaction_area` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
`interaction_area_x` int NOT NULL DEFAULT '0',
`interaction_area_y` int NOT NULL DEFAULT '0',
`interaction_area_radius` int NOT NULL DEFAULT '0',
`interaction_area_width` int NOT NULL DEFAULT '0',
`interaction_area_height` int NOT NULL DEFAULT '0',
`detail_view` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`detail_view_x` int NOT NULL DEFAULT '0',
`detail_view_y` int NOT NULL DEFAULT '0',
`detail_view_z` int NOT NULL DEFAULT '0',
`detail_view_distance` int NOT NULL DEFAULT '0',
`detail_view_extern` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL,
`author` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`title` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`year` int NOT NULL DEFAULT '0',
`material` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`dimensions` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`lender` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
`description` mediumtext CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE `tag_values` (
`group_id` int NOT NULL,
`tag_id` int NOT NULL,
`value` int NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
ALTER TABLE `groups`
ADD PRIMARY KEY (`id`);
ALTER TABLE `infos`
ADD PRIMARY KEY (`id`);
ALTER TABLE `layers`
ADD PRIMARY KEY (`id`),
ADD KEY `object_id` (`object_id`);
ALTER TABLE `media`
ADD PRIMARY KEY (`id`),
ADD KEY `layer_id` (`layer_id`);
ALTER TABLE `objects`
ADD PRIMARY KEY (`id`),
ADD KEY `group_id` (`group_id`);
ALTER TABLE `tag_values`
ADD PRIMARY KEY (`group_id`,`tag_id`);
ALTER TABLE `groups`
MODIFY `id` int NOT NULL AUTO_INCREMENT;
ALTER TABLE `infos`
MODIFY `id` int NOT NULL AUTO_INCREMENT;
ALTER TABLE `layers`
MODIFY `id` int NOT NULL AUTO_INCREMENT;
ALTER TABLE `media`
MODIFY `id` int NOT NULL AUTO_INCREMENT;
ALTER TABLE `objects`
MODIFY `id` int NOT NULL AUTO_INCREMENT;
ALTER TABLE `layers`
ADD CONSTRAINT `layer_object_constraint` FOREIGN KEY (`object_id`) REFERENCES `objects` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT;
ALTER TABLE `media`
ADD CONSTRAINT `media_layer_constraint` FOREIGN KEY (`layer_id`) REFERENCES `layers` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT;
ALTER TABLE `objects`
ADD CONSTRAINT `object_group_constraint` FOREIGN KEY (`group_id`) REFERENCES `groups` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT;
ALTER TABLE `tag_values`
ADD CONSTRAINT `tag_value_group_constraint` FOREIGN KEY (`group_id`) REFERENCES `groups` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT;
COMMIT;