A second brain and a data warehouse have the same shape: source, integration, delivery. And every reliable system is built from the same five parts: structure, data, AI, rules and skills. One page per idea, with examples from home and from work.
Not in the prompt, not in the meeting. A connected, well-shaped knowledge base is what makes the rest work.
Archive becomes source the moment something can query it. The information is usually already there — unread.
The model is roughly the same for everyone. Rent the AI; own the structure.
Everyone says "data + AI". Rules are what make output reliable and explainable: generate, validate against known context, flag don't guess.
Codified workflows and know-how, so a result is engineered — not improvised once and lost.
Structure + data + AI + rules + skills compounds into a system — the difference between a toy and an instrument.