Store daily visibility report with sampled prompts and pass/fail results.
last_tested_at timestamp.
prompt_id: Prompt ID (integer)prompt: The prompt text (string)entity_id: Entity UUID (string)entity_name: Entity name (string)entity_type: "business" or "product" (string)platforms: Object with platform visibility results (boolean for each platform)"success" or "error"total_checked: Number of prompts checkedplatforms_breakdown: Object with count per platform (e.g., {"chatgpt": 7, "claude": 6, ...})