Major improvement, security handling, file handling +fixes

migrations/005_show_author.sql

@@ -0,0 +1 @@
+ALTER TABLE contents ADD COLUMN show_author INTEGER NOT NULL DEFAULT 1;

migrations/006_dedup.sql

@@ -0,0 +1,3 @@
+ALTER TABLE content_files ADD COLUMN plaintext_hash BLOB;
+ALTER TABLE content_files ADD COLUMN ref_count INTEGER NOT NULL DEFAULT 1;
+CREATE INDEX idx_content_files_plaintext_hash ON content_files(plaintext_hash);

migrations/007_hash_blacklist.sql

@@ -0,0 +1,5 @@
+CREATE TABLE hash_blacklist (
+    hash BLOB PRIMARY KEY,
+    created_at DATETIME NOT NULL DEFAULT (datetime('now')),
+    reason TEXT
+);