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ModSecurity
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. It has a robust event-based programming language which provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Looks like the webserver has a Web application firewall installed (WAF). My would guess this https://github.com/SpiderLabs/ModSecurity. Has nothing to do with AWS database per se, the WAF is running on the server along Apache, as a module. Log entry was triggered because an SQL injection attempt was detected and stopped. As it looks now the website is potentially under attack.