Lots of features, first version that reliably crawls Geminispace.

- [x] Concurrent downloading with workers
- [x] Concurrent connection limit per host
- [x] URL Blacklist
- [x] Save image/* and text/* files
- [x] Configuration via environment variables
- [x] Storing snapshots in PostgreSQL
- [x] Proper response header & body UTF-8 and format validation
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db/backup-table.sql

@@ -0,0 +1,16 @@
+BEGIN;
+
+-- Increase statement timeout
+SET statement_timeout = '10min';
+
+-- Step 1: Create a new table with the same schema
+CREATE TABLE backup (LIKE snapshots INCLUDING ALL);
+
+-- Step 2: Copy data from the old table to the new one
+INSERT INTO backup SELECT * FROM snapshots;
+
+-- (Optional) Step 3: Truncate the original table if you are moving the data
+-- TRUNCATE TABLE snapshots;
+
+-- Commit the transaction if everything went well
+COMMIT;