batch upload impl

internal/database/migrations/00000000000104_add_batch_storage_columns.down.sql

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+-- Remove storage columns and constraint
+ALTER TABLE batch_uploads DROP CONSTRAINT IF EXISTS batch_storage_required;
+ALTER TABLE batch_uploads DROP COLUMN IF EXISTS file_size_bytes;
+ALTER TABLE batch_uploads DROP COLUMN IF EXISTS archive_key;
+ALTER TABLE batch_uploads DROP COLUMN IF EXISTS archive_bucket;

internal/database/migrations/00000000000104_add_batch_storage_columns.up.sql

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+-- Add storage metadata columns to batch_uploads table
+ALTER TABLE batch_uploads ADD COLUMN archive_bucket text;
+ALTER TABLE batch_uploads ADD COLUMN archive_key text;
+ALTER TABLE batch_uploads ADD COLUMN file_size_bytes bigint;
+
+-- Add constraint to ensure storage metadata is consistent (if any storage field is set, bucket and key must both be set)
+ALTER TABLE batch_uploads ADD CONSTRAINT batch_storage_consistent 
+CHECK (
+  (archive_bucket IS NULL AND archive_key IS NULL AND file_size_bytes IS NULL) OR
+  (archive_bucket IS NOT NULL AND archive_key IS NOT NULL)
+);