Overview
Ragnarok is the deterministic execution layer of the Mimir Labs data platform. It is a standalone, air-gapped desktop application responsible for migrating data between enterprise systems using a structured, repeatable process.
Unlike traditional migration tooling, Ragnarok does not rely on AI, heuristics that change over time, or cloud services. All behavior is deterministic, inspectable, and reproducible. The system operates entirely locally, interacting only with source and target databases.
Ragnarok consumes structured manifests generated by Ratatosk and executes migrations against a target schema using the Mimisbrunnr semantic model as its reference framework.
Architectural Role
Ragnarok is the execution component within a three-part system:
- Ratatosk: discovery, classification, and manifest generation
- Ragnarok: mapping refinement, validation, and migration execution
- Bifrost: post-migration synchronization and orchestration
Ragnarok is not responsible for discovery or ongoing integration. Its role is singular: to take a defined semantic mapping and produce a controlled, auditable migration outcome.
Design Principles
Ragnarok is built around several non-negotiable constraints:
- Determinism — All classification, mapping, and transformation logic is rule-based and repeatable. Identical inputs produce identical outputs.
- Air-Gapped Operation — The system operates without internet connectivity. Data movement occurs only between explicitly defined source and target systems.
- Target Preservation — The target schema is treated as authoritative. No destructive or adaptive changes are made to the target. All transformations occur on the source side.
- System Agnosticism — Ragnarok is target-agnostic. It can migrate data into any PostgreSQL or ODBC-accessible database. Yggdrasil ERP is available as an optional target preset that enables multi-tenant isolation, operator authentication, and automatic tenant scoping, but it is not required. The tool suite operates independently of any specific ERP platform.
Migration Model
Ragnarok executes migrations through a staged pipeline. Each stage produces artifacts that feed the next, enforcing structure and traceability throughout the process.
Stage 1 — Taxonomy Classification
The source schema is analyzed and grouped into business domains. Classification is derived from:
- foreign key graph structure
- column archetypes
- naming patterns
This establishes the contextual boundary for all subsequent mapping.
Stage 2 — Automated Mapping
Source elements are matched to target structures using domain-constrained comparison techniques. Matching considers:
- string similarity
- synonym normalization
- domain alignment
This produces an initial mapping hypothesis.
Stage 3 — Semantic Review
Mappings are reviewed and corrected by an operator. This step ensures that semantic intent is preserved and prevents propagation of incorrect assumptions.
Stage 4 — Gap Analysis
The system identifies:
- unmapped source elements
- missing required target fields
- incompatible data types
This stage converts ambiguity into explicit decisions.
Stage 5 — Ingestion
Data is migrated using an ordered execution plan that respects relational dependencies and validation constraints.
Core Engines
Taxonomy Engine
Builds a structural understanding of the source system by combining relational topology with semantic inference. The output is a domain-scoped representation of the source schema.
Mapping Engine
Generates candidate mappings between source and target elements using constrained comparison techniques. Matching is limited to domain context to prevent cross-domain ambiguity.
Type Compatibility Layer
Normalizes data types across database platforms and evaluates transformation safety. Each mapping is classified as compatible, lossy, or invalid.
Migration Plan
The migration plan is the central execution artifact. It contains:
- table ordering based on dependency graph
- column mappings and transformations
- default value strategies
- validation rules
The plan is serializable, allowing pause, review, and resumption.
Execution Pipeline
Migration execution follows a strict sequence:
- Load migration plan
- Order tables via dependency graph
- Extract data in batches
- Apply transformations
- Validate against constraints
- Insert into target system
- Resolve deferred relationships
- Produce migration report
Bulk operations are optimized using database-native mechanisms to maximize throughput while maintaining validation guarantees.
Data Quality and Governance
Ragnarok treats migration as a governed process rather than a data transfer.
Validation includes:
- type conformity
- constraint enforcement
- referential integrity
- domain-specific rule checks
Metrics are captured throughout execution, including throughput, error rates, and coverage.
The system produces governance artifacts such as lineage reports, gap analyses, and migration manifests. These artifacts serve as inputs for downstream systems and audit processes.
Security Model
Ragnarok is designed for controlled environments where data sensitivity is high.
- No external network communication
- No persistent credential storage
- In-memory processing of sensitive data
- Full audit logging of migration activity
Access is restricted to authorized operators with administrative roles.
User Interface Model
The interface is structured as a full application shell with persistent sidebar navigation and progressive stage unlocking. The sidebar provides access to ten pages: Connections, Taxonomy, Mapping, Review, Gap Analysis, Ingestion, Rules, Diagnostics, Health Monitor, and Plans. Pages become accessible as the migration session progresses through defined stages, enforcing process discipline while allowing operators to revisit earlier stages for review or correction.
The Connections page supports a target preset system. The default "Custom Database" mode accepts any PostgreSQL or ODBC connection with operator-selectable drivers. The "Yggdrasil ERP (Multi-tenant)" preset locks the driver to PostgreSQL, enables tenant selection, requires PBKDF2 operator authentication, and automatically prepends tenant isolation columns during ingestion.
A central MigrationSession object manages all state and emits typed signals for cross-page communication, ensuring that changes in one stage are immediately reflected throughout the application.
Platform Significance
Ragnarok transforms data migration from an ad hoc engineering task into a controlled, semantic process. By separating classification, mapping, validation, and execution into discrete stages, it eliminates ambiguity and makes migration behavior predictable.
Within the broader platform, Ragnarok is the mechanism that converts semantic understanding into operational reality. Like all tools in the Mimir Labs suite, it is system-agnostic — it uses Mimisbrunnr as a semantic reference vocabulary, not as a hard target dependency. Organizations can use Ragnarok to migrate data between any combination of enterprise systems without adopting Yggdrasil ERP.
It does not define meaning. It enforces it.
Copyright 2026 Mimir Labs. All rights reserved.