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BASE_DB_TIER=sql opened PostgreSQL and then spoke to it in SQLite: strftime, sqlite_master, json_extract, json_each, an INTEGER column holding an int64, an outer join with no ON, backticked identifiers, and a rowid that only one engine has. The tier picked a backend the queries could not reach. Every one of those now comes from hanzoai/orm/dialect, resolved once from the driver the data DB was opened with and reachable as app.Dialect(). Base holds no switch on the engine — it asks for the JSON accessors, the schema catalog, the generated instant and identifier, and the column types, and it asks whether a feature exists at all where one engine has nothing to offer: an insertion-order column, a write-ahead log to fold, a function that renders an instant. Empty means the caller falls back or refuses rather than emitting something the engine will reject. Some differences turned out not to need a dialect at all. An instant is stored as text in a fixed layout, so bucketing the log rollup to the hour is a substring rather than a calendar function, which every engine spells the same way and an index can be built on. Null-safe equality is IS NOT DISTINCT FROM. An int64 column is BIGINT. A join with nothing of its own to match still states a condition. Case-insensitive comparison stays COLLATE NOCASE, because the schema now asks the engine for the collation that name refers to. The proof is a Postgres 18 running the data plane: migrations apply, a collection created over /v1 lands as a table with text, numeric and jsonb columns and its declared index, and records insert, page, sort, filter across scalars, multi-value elements and JSON paths, update and delete. A unique index declared COLLATE NOCASE rejects the second spelling of a handle. Comparing a JSON sub-path to a number is refused there: the extraction yields text, the literal binds as a number, and the filter language does not say which the comparison meant. Compared as text it works.