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VCL-total (VCL Total Type-Safe) — Show Me The Receipts

Table of Contents

The README makes claims. This file backs them up.

VeriSimDB does not merely store records. It maintains identity consonance across modal witnesses and federation boundaries. VCL expresses propositions and epistemic requests over that consonance state. VCL-total validates whether proposed identity transitions are admissible.

VCL vs VCL-total vs VeriSimDB

  • VeriSimDB — the federated consonance engine; maintains identity consonance across the octad of modal witnesses (graph, vector, tensor, semantic, document, temporal, provenance, spatial).

  • VCL — the production consonance language: propositions (DECLARE / ASSERT / RETRACT) and epistemic requests (INSPECT / VERIFY), plus MERGE / SPLIT / NORMALISE. It is not SQL-with-types and not queries against a passive store.

  • VCL-total — this project: the proof-bearing safety substrate behind VCL. It decides whether a proposed identity transition is admissible — well-formed, type-safe, authorised, resource-safe, proof-supported — before it affects live consonance state. The 10 type-safety levels below are how it proves that.

Claims Substantiation

Claim 1: "Satisfies all 10 levels of type safety — the 6 established IO-covered forms and 4 additional forms identified through research"

How it works: VCL-total layers a progressive type-safety pipeline. Levels 1-6 (parse-time, schema-binding, type operations, null-tracking, injection-proof, result-type) are implemented in the Idris2 type checker (src/interface/abi/VQLType.idr) as dependent types. Parse-time safety uses a total parser (Idris2 %default total, no partiality). Schema-binding binds column references to Idris2 dependent records indexed by schema version. Null-tracking threads nullable flags through type-level join algebra. Injection-proof uses parameterized query types that forbid string interpolation by construction. Levels 7-10 (cardinality, effect-tracking, temporal, linearity) use quantitative type theory (QTT) on connection handles, session types for transaction state, modal types for world/scope-indexed queries. The ReScript parser extends VeriSimDB’s surface syntax; the Zig FFI codegen produces C-ABI transition plans that VeriSimDB’s octad (8-modal) consonance engine executes.

Caveat: Levels 7-10 are research-level and incompletely proven. Cardinality inference may have false negatives on complex aggregations. Temporal safety assumes monotonic clocks (breaks on time skew). Linearity is enforced syntactically but not yet proven to match Idris2’s QTT semantics. For production, restrict to levels 1-6 (proven on 49 test cases).

Evidence: src/interface/abi/VQLType.idr defines levels 1-6 with %default total; src/interface/abi/VQLCardinality.idr and src/interface/abi/VQLLinear.idr define levels 7, 10 (incomplete). src/parser/ extends VCL parser. src/interface/ffi/codegen.zig emits query plans. Tests in tests/ cover all 10 levels.

Claim 2: "Proof-bearing statements (with PROOF clause) go through L9-L10 validation automatically"

How it works: When a user writes SELECT * FROM users PROOF ATTACHED theorem_name, the parser tags the query with proof metadata. The type checker looks up theorem_name in the proof store and type-checks the proof against the query’s result type. If the proof type-checks in Idris2, a ProvedResult sigma type is returned; otherwise, a compile-time error blocks execution. The 6 proof types (EXISTENCE, INTEGRITY, CONSISTENCY, PROVENANCE, FRESHNESS, AUTHORIZATION) are Idris2 propositions with constructors matching their semantics. This ensures queries are executed only when supporting evidence is present.

Caveat: Proof attachment is manual—users must write proofs. Automated proof synthesis would ease adoption but is beyond current scope. Proof validation happens at compile-time, not runtime, so a mismatch between proof and actual data is undetected.

Evidence: src/interface/abi/VQLProof.idr defines proof types (ExistenceProof, IntegrityProof, etc.). Parser in src/parser/ recognizes PROOF clause. Type checker in src/interface/abi/VQLChecker.idr validates proof attachment. Tests in tests/proof_*.rescript demonstrate all 6 proof types.

Technology Choices

Technology Learn More

Idris2

Dependent types, totality checking, quantitative type theory (levels 1-10)

Zig

FFI codegen to C ABI (zero-copy result sets)

ReScript

Parser extending VeriSimDB VCL grammar

zig

REST/gRPC/GraphQL API layer

VeriSimDB

octad (8-modal) consonance engine execution target

File Map

Path Purpose

src/interface/abi/

Idris2 ABI (THE TRUTH): type system, levels 1-10, proof types

src/interface/abi/VQLType.idr

Core type checker: parse-time, schema-binding, operations, nullability, injection, results (L1-L6)

src/interface/abi/VQLCardinality.idr

Cardinality inference with exactly-one/at-most-one/many (L7)

src/interface/abi/VQLEffect.idr

Read/Write/DDL effects as tracked monad (L8)

src/interface/abi/VQLTemporal.idr

Bi-temporal and system-time query bounds (L9)

src/interface/abi/VQLLinear.idr

Linear types on connections and transactions (L10, incomplete)

src/interface/abi/VQLProof.idr

Proof types: EXISTENCE, INTEGRITY, CONSISTENCY, PROVENANCE, FRESHNESS, AUTHORIZATION

src/interface/ffi/

Zig FFI bridge

src/interface/ffi/codegen.zig

Compiles type-checked query AST to C-ABI query plan

src/interface/ffi/verisimdb_bridge.zig

Marshals query plans to VeriSimDB engine, unmarshals results

src/parser/

ReScript parser extending VeriSimDB VCL surface syntax

src/parser/vcl_parser.res

Lexer + parser for .vcltotal files, PROOF clause support

src/api/

zig API layer for external clients

src/api/rest.v

REST endpoint bindings (HTTP API)

src/api/grpc.v

gRPC service definitions

src/api/graphql.v

GraphQL schema bindings (if enabled)

tests/

Test suite: 49 passing tests covering L1-L10

tests/l1_parse.rescript

Level 1: parse-time safety (syntax errors caught)

tests/l2_schema.rescript

Level 2: schema-binding (column name mismatch caught)

tests/l3_type_ops.rescript

Level 3: type-incompatible operations (string + int rejected)

tests/l4_null.rescript

Level 4: null-tracking (nullable field projections guarded)

tests/l5_injection.rescript

Level 5: injection-proof (parameterized queries only)

tests/l6_result.rescript

Level 6: result-type safety (type known at compile-time)

tests/l7_cardinality.rescript

Level 7: cardinality (exactly-one vs many inferred)

tests/l8_effects.rescript

Level 8: effect-tracking (write queries refused in pure context)

tests/l9_temporal.rescript

Level 9: temporal bounds (time-skew detection)

tests/l10_linear.rescript

Level 10: linearity (use-after-close impossible)

tests/proof_*.rescript

Proof attachment tests (all 6 proof types)

Dogfooted Across The Account

| Project | Integration | | panic-attacker | Scans VCL-total parser for injection vulnerabilities in PROOF clause parsing | verisimdb | VCL-total is the proof-bearing safety substrate for VeriSimDB’s octad (8-modal) consonance engine | typell | VCL-total instantiates TypeLL’s 10-level framework for database queries | panll | PanLL panels visualize VCL-total query execution with proof status

Readiness

CRG Grade: C (Beta) - Levels 1-6 production-ready (49 tests passing, 0 believe_me), Levels 7-10 experimental (research proofs incomplete). Can use L1-L6 today for type-safe consonance statements; L7-10 for future proof-bearing use cases.