Update TEP 155 status

This TEP for storing pipeline events in db has been implemented.

Author: khrm

teps/0155-store-pipeline-events-in-db.md

@@ -1,5 +1,5 @@
 ---
-status: proposed
+status: implemented
 title: Store Pipeline Events in Tekton Results
 creation-date: '2023-11-30'
 last-updated: '2024-04-19'
@@ -227,6 +227,7 @@ behavior or add a feature that may replace and deprecate a current one.
 ### Implementation Pull Requests
 
 POC PR: https://github.com/tektoncd/results/pull/745
+Implementation PR: https://github.com/tektoncd/results/pull/748
 
 ## References
 

teps/README.md

@@ -144,5 +144,5 @@ This is the complete list of Tekton TEPs:
 |[TEP-0152](0152-tekton-conformance-verification.md) | Tekton Conformance Verification | implementable | 2024-02-12 |
 |[TEP-0153](0153-v1-migration-for-tekton-results.md) | Migration of Tekton Results to V1 APIs of Pipelines | proposed | 2023-08-14 |
 |[TEP-0154](0154-concise-remote-resolver-syntax.md) | Concise Remote Resolver Syntax | implementable | 2024-03-21 |
-|[TEP-0155](0155-store-pipeline-events-in-db.md) | Store Pipeline Events in Tekton Results | proposed | 2024-04-19 |
+|[TEP-0155](0155-store-pipeline-events-in-db.md) | Store Pipeline Events in Tekton Results | implemented | 2024-04-19 |
 |[TEP-0156](0156-whenexpressions-in-step.md) | WhenExpressions in Steps | proposed | 2024-04-15 |