Struct TableMeta 

pub struct TableMeta {
    pub columns: Vec<String>,
    pub pk: Vec<usize>,
    pub col_types: Vec<ColType>,
    pub nullable: Vec<bool>,
}

What a table registration records (the column order + PK columns drive Mutation→SQL; the per-column ColType feeds schema codegen via /schema).

Fields

columns: Vec<String>

pk: Vec<usize>

col_types: Vec<ColType>

One ColType per entry in columns (same order). For introspected tables these are derived from the declared SQLite type (ColType::from_sqlite_decl — BOOLEAN/JSON recognized by name, else affinity); for typed registrations they are the declared types. On a PG-mirror follower they are instead recovered from the _rindle_columns sidecar (coltype_from_sidecar), whose semantic tags outlive the affinity-only mirror DDL.

nullable: Vec<bool>

One nullability flag per entry in columns (same order): true when the column is nullable (SQLite pragma_table_info.notnull == 0, or the _rindle_columns sidecar’s not_null on a PG-mirror follower, whose mirror DDL is permissive), false for NOT NULL. Feeds the generated client schema’s .nullable() via /schema (design 206). This is the raw DDL/sidecar fact — the PK non-null exception is applied in base_table_schemas, not here.