Initial data model

User owns trips, tackle items, catches, and private waypoints.
WaterBody has geography, access metadata, and known Species.
Trip targets one water body, a time window, and one or more species.
ConditionSnapshot records normalized observations and forecast provenance.
Recommendation belongs to a trip and stores evidence, setup, confidence, and engine version.
Conversation is scoped to a user and optionally an active trip.
Catch records outcome, conditions, presentation, and independently controlled location visibility.