The problem lies in the Race Modifiers table where the value of EconomicProdModifier has been set to 0.01 How this has happened I have no idea - Steve would have to say what addresses this field. ( I have tried but there is nothing I can see in the front end that affect this).
It seemed to be working OK until around 27 April 2053, where there was still stuff being built, and the only unusual thing in the log I can see is the reassignment of officers on 11th June (you didn't terminate that in the middle did you?).
I can reset the value in that table if you like, if there is somewhere I can drop the file. Bear in mind that Steve will then consider it a modified database and therefore unsupported. To be quite honest I'd be tempted to restart.
Oh and by the way, if you DO consider continuing, kill the 10 Size 4.953 Anti ship missiles in Ross 248 using the Missiles in Flight tab of the Battle Control Window (F8). They are probably slowing things down dramatically as they are constantly checking for new targets, and with an endurance of 2 years that will go on for a very long time.