To reduce the Current consumption I decided to design a POWER GATEING CHIP into my design. 

This Power Gateing Chip  can disable the complete Power supply with an MOSFet.

With this little trick the Quiescent current drops dramtically when the wallswitch is not in Use.

According to the datasheet this leads to a low current of 50nA when the design is not in use.

This RTC Chips wakes up based on the the resistors designed around the Delay Pin.

With the Resistors R6 you may define the sleep period where the Mikrocontroller shall not get any POWER.

Once operation of the wall switch is finished the Microcontroller may send a "Done" Signal via TP6 to the Power Gateing Chip. This enables low power sleep until an ext Event is triggered via Shot or a timer has run low.

The time of the timer may be set statically via R6.

If connected to the 230 V MAINS power(via an ext. power supply) you may use it in always on mode: Therefore R20 is introduced. This may enable the Power Supply at all times.