Davis Webb put his bright future on hold for a chance to rewrite the story of his past.

The free-agent quarterback signed a futures contract Monday with the Giants, the team that drafted him in the third round in 2017 and once cast him as the first true heir apparent to Eli Manning. Webb spent the past three seasons with the Bills — where he grew close to Buffalo offensive coordinator-turned-Giants head coach Brian Daboll — and was available now because he was last on the practice squad.

Webb, 27, faced an interesting decision this offseason, sources told The Post. He turned down an offer to begin his coaching career in Buffalo and the golden ticket of mentoring quarterback Josh Allen in order to follow Daboll to the Giants, where he will compete to be Daniel Jones’ primary backup with a yet-to-be-determined challenger. Mike Glennon is not expected to re-sign.

“There’s not a person that would want me to succeed professionally, playing or coaching, more than Dabes,” Webb recently told The Post. “You feel that whenever he talks and in the way he does it. He has a unique ability to bring the best out of everyone. I’m a way better player and a way better person than I was earlier because of him. When I do get into coaching, I’m going to take the most I’ve ever learned from him.”

With Manning’s career winding down, Webb was drafted by then-general manager Jerry Reese in 2017. Webb was cut after one season when new GM Dave Gettleman wanted his own quarterback in fourth-rounder Kyle Lauletta. Then Lauletta was cut after one season to make room for the first-rounder Jones. Now GM Joe Schoen — another Bills connection — and Daboll are running the show, and Webb is back.

“I know that pairing,” Webb said before signing, “and I know [Giants co-owners] Mr. [John] Mara and Mr. [Steve] Tisch, and I know how badly they want this to work from my time there. I know how much time they put into it. They want success, and I really believe in my heart that they can do it. They are teaming up at a special place.”

Webb, who spent the 2018 season with the Jets, made his long-awaited NFL debut last season. The Giants now have the Bills’ third- and fourth-stringers from last season when pairing Webb with Jake Fromm, who started two games for Big Blue at the end of the season after he was signed off Buffalo’s practice squad.

The Giants let go of co-director of player personnel Mark Koncz, who was Gettleman’s top outside addition to the front office. Koncz arrived in 2018 after working under Gettleman with the Panthers. … Wink Martindale and Steve Wilks became the first candidates for defensive coordinator to receive second interviews during the in-person round. … Punter Jamie Gillan — a veteran of 44 games with the Browns — also signed a futures contract. Riley Dixon is coming off a poor season and costs $3.1 million against the salary cap.