Initial commit

migrations/003_document_assets.sql

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+CREATE TABLE osint.assets (
+  id TEXT PRIMARY KEY,
+  level_id TEXT NOT NULL REFERENCES osint.levels(id) ON DELETE CASCADE,
+  original_name TEXT NOT NULL,
+  mime_type TEXT NOT NULL,
+  byte_size BIGINT NOT NULL CHECK (byte_size >= 0),
+  content BYTEA NOT NULL,
+  checksum_sha256 TEXT NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX assets_level_idx ON osint.assets(level_id, created_at);
+
+ALTER TABLE osint.widgets
+  ADD COLUMN asset_id TEXT REFERENCES osint.assets(id) ON DELETE SET NULL;
+
+COMMENT ON TABLE osint.assets IS 'Uploaded source files used by database-backed document widgets';