Enhance crawler with seed list and SQL utilities

Add seedList module for URL initialization, comprehensive SQL utilities for database analysis, and update project configuration.

misc/sql/snapshots_by_timeframe.sql

@@ -0,0 +1,37 @@
+-- File: snapshots_by_timeframe.sql
+-- Shows snapshot count by timeframe (day, week, month)
+-- Usage: \i misc/sql/snapshots_by_timeframe.sql
+
+WITH daily_snapshots AS (
+    SELECT 
+        date_trunc('day', timestamp) as day,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT url) as unique_urls
+    FROM snapshots
+    GROUP BY day
+    ORDER BY day
+),
+weekly_snapshots AS (
+    SELECT 
+        date_trunc('week', timestamp) as week,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT url) as unique_urls
+    FROM snapshots
+    GROUP BY week
+    ORDER BY week
+),
+monthly_snapshots AS (
+    SELECT 
+        date_trunc('month', timestamp) as month,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT url) as unique_urls
+    FROM snapshots
+    GROUP BY month
+    ORDER BY month
+)
+SELECT 'Daily' as timeframe, * FROM daily_snapshots
+UNION ALL
+SELECT 'Weekly' as timeframe, * FROM weekly_snapshots
+UNION ALL
+SELECT 'Monthly' as timeframe, * FROM monthly_snapshots
+ORDER BY timeframe, day;