Data and timing-model analysis for: Large Transit-timing Variations in the 49.7 day Transit Candidate TIC 300164137

Code, input tables, and results for the timing-model analysis in the Research Note "Large Transit-timing Variations in the 49.7 day Transit Candidate TIC 300164137" (S. Bai 2026, submitted to Research Notes of the AAS). Contents: the sixteen TESS mid-transit times (BJD_TDB - 2457000) used in the note; the QLP light-curve table used for the stacked transit and an exploratory residual search; coplanar two-companion TTVFast timing fits in period-ratio bins; finite-time MEGNO screening with REBOUND using TTVFast-consistent initial conditions; a restricted stellar-perturber search; the epoch-61 (2026 November 16) model table; and the data behind the figure. README.md gives the order of execution, software versions, and known limitations. The dynamical fits are timing-only examples from a finite search. They are not posterior distributions, mass measurements, or a census of long-term-stable architectures, and the epoch-61 model range is not a confidence interval. An unconverged near-2:1 MCMC run is included for transparency only and is not used in the note. QLP light curves: Huang et al. (2020), Research Notes of the AAS, 4, 204, obtained from MAST.