SAT TRACON Controller reported an air carrier on final approach reported unidentified VFR traffic was 'just below him'. The Controller reported they climbed a military aircraft on approach to avoid a conflict with an unidentified VFR aircraft a few minutes later. In both conflicts the VFR aircraft departed an uncontrolled airport located under the final approach course.

Narrative

Aircraft X was at 4000 ft. on vectors to Visual Approach to SAT about 15 miles out 1 mile north of 5C1. Aircraft X called and said 'hey we just missed traffic do you see anything?' I had no target on my scope and told Aircraft X the same. He said the traffic was 'just below him and 1/2 mile'. That would put that traffic; between 3500 to 3900 ft. on a 15 mile final; at an international airport; with no transponder. Five minutes later; Aircraft Z was at 4000 ft. 5 miles south-southwest of 5C1; on vectors to an approach. I noticed a 1200 code depart 5C1; southwest bound and climbing. I began issuing traffic to Aircraft Z when they were about 4 miles apart; traffic was at 2900 ft. Later issued traffic again; at 3300 ft. indicating now and 2 miles. And again; I call and tell Aircraft Z to climb and maintain 4500 ft.; traffic now out 3600 ft. and 1 mile. Aircraft Z calls 'got traffic in sight; he is right where we would have been; thank you approach' I have been here [many] years; I don't know how many reports I have done on 5C1. I know I stopped doing them years ago and watched events happen week after week. Numerous unsafe situations that are left unreported because we feel nothing will be done. It's clear to me now; in this agency; safety is not the number one priority. Dollars over Safety. How many reports do you need? How many CPC's do you need to tell you that 5C1 is unsafe? The talks with 5C1 pilots do not work; no more talking. I'm here again to remind you; 5C1 is getting busier every year. We NEED Class B or AT MINIMUM a Class C extension. Class B would be the most safe response as it would allow us to protect other key areas. Let's stop waiting for the inevitable catastrophe to respond; we need your help.