Concept Traditional Database Solana Accounts The Basic Unit A row in a table An account — a fixed chunk of on-chain storage tied to a public key Who Owns It The company running the database The keypair holder. Period. No admin override. No "forgot password." How You Prove Identity Username + password (stored and verified by the server) Cryptographic signature with your private key — math proves you, not a middleman How Data is Stored Flexible schemas, columns, data types — ALTER TABLE whenever you want Raw bytes. You decide the structure. The chain just holds the blob. Storage Cost Usually a flat subscription or server cost You pay rent in SOL proportional to how many bytes you store. No free lunch. Who Can Write to It Anyone the app gives write permission to Only the account's owner program can modify data. Not even you directly — your keypair just authorizes it. Deleting Data DELETE FROM table WHERE id = x Close the account, reclaim the rent. The data is gone, the SOL comes back.…