Index database metrics by backend

[pm47]

No description provided.

[codecov-io]

Codecov Report

Merging #1758 (3aec5fe) into master (5f68bf9) will increase coverage by 0.05%.
The diff coverage is 99.01%.

@@            Coverage Diff             @@
##           master    #1758      +/-   ##
==========================================
+ Coverage   89.17%   89.23%   +0.05%     
==========================================
  Files         143      143              
  Lines       10769    10772       +3     
  Branches      464      477      +13     
==========================================
+ Hits         9603     9612       +9     
+ Misses       1166     1160       -6     

Impacted Files	Coverage Δ
...ain/scala/fr/acinq/eclair/db/pg/PgPaymentsDb.scala	85.18% <93.33%> (ø)
.../src/main/scala/fr/acinq/eclair/db/Databases.scala	86.11% <100.00%> (ø)
...src/main/scala/fr/acinq/eclair/db/Monitoring.scala	100.00% <100.00%> (ø)
...c/main/scala/fr/acinq/eclair/db/pg/PgAuditDb.scala	98.97% <100.00%> (ø)
...ain/scala/fr/acinq/eclair/db/pg/PgChannelsDb.scala	95.94% <100.00%> (ø)
...main/scala/fr/acinq/eclair/db/pg/PgNetworkDb.scala	97.77% <100.00%> (ø)
...c/main/scala/fr/acinq/eclair/db/pg/PgPeersDb.scala	97.36% <100.00%> (ø)
...scala/fr/acinq/eclair/db/pg/PgPendingRelayDb.scala	97.05% <100.00%> (ø)
...cala/fr/acinq/eclair/db/sqlite/SqliteAuditDb.scala	99.06% <100.00%> (ø)
...a/fr/acinq/eclair/db/sqlite/SqliteChannelsDb.scala	95.94% <100.00%> (ø)
... and 6 more