Refactor code structure for improved readability and maintainability; optimize performance in key functions.

docs/modules/concelier/connectors.md

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+# Concelier Connectors
+
+This index lists Concelier connectors and links to their operational runbooks. For detailed procedures and alerting, see `docs/modules/concelier/operations/connectors/`.
+
+| Connector | Source ID | Purpose | Ops Runbook |
+| --- | --- | --- | --- |
+| EPSS | `epss` | FIRST.org EPSS exploitation probability feed | `docs/modules/concelier/operations/connectors/epss.md` |

docs/modules/concelier/operations/connectors/alpine.md

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+# Concelier Alpine SecDB Connector - Operations Runbook
+
+_Last updated: 2025-12-22_
+
+## 1. Overview
+The Alpine connector pulls JSON secdb feeds (main/community) for configured
+releases and maps CVE identifiers to APK version ranges. It preserves native
+APK versions and emits `rangeKind: apk` so downstream consumers keep distro
+semantics intact.
+
+## 2. Configuration knobs (`concelier.yaml`)
+```yaml
+concelier:
+  sources:
+    alpine:
+      baseUri: "https://secdb.alpinelinux.org/"
+      releases:
+        - "v3.18"
+        - "v3.19"
+        - "v3.20"
+      repositories:
+        - "main"
+        - "community"
+      maxDocumentsPerFetch: 20
+      fetchTimeout: "00:00:45"
+      requestDelay: "00:00:00"
+      userAgent: "StellaOps.Concelier.Alpine/0.1 (+https://stella-ops.org)"
+```
+
+### Recommendations
+- Keep `releases` to supported Alpine branches only; avoid stale branches in
+  production unless you maintain a mirror.
+- Use `requestDelay` when running multiple source connectors on shared egress.
+
+## 3. Default job schedule
+
+| Job kind | Cron | Timeout | Lease |
+|----------|------|---------|-------|
+| `source:alpine:fetch` | `*/30 * * * *` | 5 minutes | 4 minutes |
+| `source:alpine:parse` | `7,37 * * * *` | 6 minutes | 4 minutes |
+| `source:alpine:map` | `12,42 * * * *` | 8 minutes | 4 minutes |
+
+The cadence staggers fetch, parse, and map so each stage has a clean window to
+complete. Override via `concelier.jobs.definitions[...]` when coordinating
+multiple sources on the same scheduler.
+
+## 4. Offline and air-gapped deployments
+- Mirror `secdb` JSON files into a local repository and point `baseUri` to the
+  mirror host.
+- The connector allowlists only the `baseUri` host; update it to match the
+  internal mirror host.
+- Keep fixtures and exported bundles deterministic by leaving the order of
+  releases and repositories stable.

docs/modules/concelier/operations/connectors/epss.md

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+# Concelier EPSS Connector Operations
+
+This playbook covers deployment and monitoring of the EPSS connector that ingests daily FIRST.org EPSS snapshots.
+
+## 1. Prerequisites
+
+- Network egress to `https://epss.empiricalsecurity.com/` (or a mirrored endpoint).
+- Updated `concelier.yaml` (or environment variables) with the EPSS source configuration:
+
+```yaml
+concelier:
+  sources:
+    epss:
+      baseUri: "https://epss.empiricalsecurity.com/"
+      fetchCurrent: true
+      catchUpDays: 7
+      httpTimeout: "00:02:00"
+      maxRetries: 3
+      airgapMode: false
+      bundlePath: "/var/stellaops/bundles/epss"
+```
+
+## 2. Smoke Test (staging)
+
+1. Restart Concelier workers after configuration changes.
+2. Trigger a full cycle:
+   - CLI: `stella db jobs run source:epss:fetch --and-then source:epss:parse --and-then source:epss:map`
+   - REST: `POST /jobs/run { "kind": "source:epss:fetch", "chain": ["source:epss:parse", "source:epss:map"] }`
+3. Verify document status transitions: `pending_parse` -> `pending_map` -> `mapped`.
+4. Confirm log entries for `Fetched EPSS snapshot` and parse/map summaries.
+
+## 3. Monitoring
+
+- **Meter**: `StellaOps.Concelier.Connector.Epss`
+- **Key counters**:
+  - `epss.fetch.attempts`, `epss.fetch.success`, `epss.fetch.failures`, `epss.fetch.unchanged`
+  - `epss.parse.rows`, `epss.parse.failures`
+  - `epss.map.rows`
+- **Alert suggestions**:
+  - `rate(epss_fetch_failures_total[15m]) > 0`
+  - `rate(epss_map_rows_total[1h]) == 0` during business hours while other connectors are active
+
+## 4. Airgap Mode
+
+- Place snapshots in the bundle directory:
+  - `epss_scores-YYYY-MM-DD.csv.gz`
+  - Optional `manifest.json` listing `name`, `modelVersion`, `sha256`, and `rowCount`.
+- Set `airgapMode: true` and `bundlePath` to the directory or specific file.
+- The connector validates the manifest hash when present and logs warnings on mismatch.