collections and [*Mega-Archive*]{}.

Data Mining Tools
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[*Mega-Archive*]{} was designed in 2010 for asteroid searches and it was improved later, mostly after 2017 following the migration of EURONEAR to the new private dedicated server. We will present next the applications accessing the [*Mega-Archive*]{}.

Mega-Precovery for Moving Objects
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In 2010 we introduced [*Mega-Precovery*]{} to search for Solar System Objects using the [*Mega-Archive*]{} collection [@Popescu2010]. Our project targeted mostly the precovery and recovery of observations for PHAs and VIs. The algorithm and a flowchart was presented in [@Vaduvescu2013]. During last years, several major improvements were added to the project, significantly extending its functionality. These are described bellow.\
The original version (2010-2016) resided on the old EURONEAR IMCCE server. It was embedded in the old wikiplugin PHP environment and used the old ASCII archives format. The code migrated to the new EURONEAR server where it is preserved (under the Older Tools section) as version v.1 [^17]. The second version (2016-2017) updated the code to pure PHP 7 environment installed in the new EURONEAR server, and converted the [*Mega-Archive*]{} to SQL database. The code has been preserved as version v.2[^18]. The actual version 3 (released in October 2017) has implemented two options for 